"So the new dolls," Roz said in Peter"s car, carefully casual. "What"s so special about "em?"

"Man," Peter answered, brow furrowing. "Gimme a sec." Roz"s car followed as they pulled away from the house on Balmoral Road, maintaining a careful distance from the b.u.mper. Peter drove until they reached the parkway. Once they"d joined a caravan downtown, noseto-b.u.mper on the car ahead, he folded his hands in his lap and let the lead car"s autopilot take over.

He said, "What isn"t? Real-time online editing-personality and physical, appearance, ethnicity, hair-all kinds of behavior protocols, you name the kink they"ve got a hack for it."

"So if you knew somebody"s kink," she said thoughtfully. "Knew it in particular. You could write an app for that-"

"One that would appeal to your guy in specific." Peter"s hands dropped to his lap, his head bobbing up and down enthusiastically. "With a-pardon the expression-backdoor."

"Trojan horse. Don"t jilt a programmer for a s.e.x machine."

"There"s an ap for that," he said, and she snorted. "Two cases last year, worldwide. Not common, but-"

Roz looked down at her hands. "Some of these guys," she said. "They program the dolls to scream."

Peter had sensuous lips. When something upset him, those lips thinned and writhed like salted worms. "I guess maybe it"s a good thing they have a robot to take that out on."

"Unless the fantasy stops being enough." Roz"s voice was flat, without judgment. Sunlight fell warm through the windshield. "What do you know about the larval stage of serial rapists, serial killers?"

"You mean, what if pretend pain stops doing it for them? What if the appearance of pain is no longer enough?"

She nodded, worrying a hangnail on her thumb. The nitrile gloves dried out your hands.

"They used to cut up paper p.o.r.n magazines." His broad shoulders rose and fell, his suit catching wrinkles against the car seat when they came back down. "They"ll get their fantasies somewhere."

"I guess so." She put her thumb in her mouth to stop the bleeding, a thick red bead that welled up where she"d torn the cuticle.

Her own saliva stung.

Sitting in the cheap office chair Roz had docked along the short edge of her desk, Dolly slowly lifted her chin. She blinked. She smiled.

"Law enforcement override code accepted." She had a little-girl Marilyn voice. "How may I help you, Detective Kirkbride?"

"We are investigating the murder of Clive Steele," Roz said, with a glance up to Peter"s round face. He stood behind Dolly with a wireless scanner and an air of concentration. "Your contract-holder of record."

"I am at your service."

If Dolly were a real girl, the bare skin of her thighs would have been sticking to the recycled upholstery of that office chair. But her realisticallyengineered skin was breathable polymer. She didn"t sweat unless you told her to, and she probably didn"t stick to cheap chairs.

"Evidence suggests that you were used as the murder weapon." Roz steepled her hands on her blotter. "We will need access to your software update records and your memory files."

"Do you have a warrant?" Her voice was not stiff or robotic at all, but warm, human. Even in disposing of legal niceties, it had a warm, confiding quality.

Silently, Peter transmitted it. Dolly blinked twice while processing the data, a sort of status bar. Something to let you know the thing wasn"t hung.

"We also have a warrant to examine you for DNA trace evidence," Roz said.

Dolly smiled, her raven hair breaking perfectly around her narrow shoulders. "You may be a.s.sured of my cooperation."

Peter led her into one of the interrogation rooms, where the operation could be recorded. With the help of an evidence tech, he undressed Dolly, bagged her clothes as evidence, brushed her down onto a sheet of paper, combed her polymer hair and swabbed her polymer skin. He swabbed her orifices and sc.r.a.ped under her nails.

Roz stood by, arms folded, a necessary witness. Dolly accepted it all impa.s.sively, moving as directed and otherwise standing like a caryatid. Her engineered body was frankly s.e.xless in its perfection-belly flat, hips and a.s.s like an inverted heart, b.r.e.a.s.t.s floating cartoonishly beside a defined rib cage. Apparently, Steele had liked them skinny.

"So much for pulchritudinousness," Roz muttered to Peter when their backs were to the doll.

He glanced over his shoulder. The doll didn"t have feelings to hurt, but she looked so much like a person it was hard to remember to treat her as something else. "I think you mean voluptuousness," he said. "It is a little too good to be true, isn"t it?"

"If you would prefer different proportions," Dolly said, "My cha.s.sis is adaptable to a range of forms-"

"Thank you," Peter said. "That won"t be necessary."

Otherwise immobile, Dolly smiled. "Are you interested in science, Detective King? There is an article in Nature this week on advances in the polymerase chain reaction used for replicating DNA. It"s possible that within five years, forensic and medical DNA a.n.a.lysis will become significantly cheaper and faster."

Her face remained stoic, but Dolly"s voice grew animated as she spoke. Even enthusiastic. It was an utterly convincing-and engaging-effect.

Apparently, Clive Steele had programmed his s.e.x robot to discourse on molecular biology with verve and enthusiasm.

"Why don"t I ever find the guys who like smart women?" Roz said.

Peter winked with the side of his face that faced away from the companion. "They"re all dead."

A few hours after Peter and the tech had finished processing Dolly for trace evidence and Peter had started downloading her files, Roz left her pa.r.s.er software humming away at Steele"s financials and poked her head in to check on the robot and the cop. The techs must have gotten what they needed from Dolly"s hands, because she had washed them. As she sat beside Peter"s workstation, a cable plugged behind her left eat, she cleaned her lifelike polymer fingernails meticulously with a file, dropping the sc.r.a.pings into an evidence bag.

"Sure you want to give the prisoner a weapon, Peter?" Roz shut the ancient wooden door behind her.

Dolly looked up, as if to see if she was being addressed, but made no response.

"She don"t need it," he said. "Besides, whatever she had in her wiped itself completely after it ran. Not much damage to her core personality, but there are some memory gaps. I"m going to compare them to backups, once we get those from the scene team."

"Memory gaps. Like the crime," Roz guessed. "And something around the time the Trojan was installed?"

Dolly blinked her long-lashed blue eyes languorously. Peter patted her on the shoulder and said, "Whoever did it is a pretty good cracker. He didn"t just wipe, he patterned her memories and overwrote the gaps. Like using a clone tool to photoshop somebody you don"t like out of a picture."

"Her days must be pretty repet.i.tive," Roz said. "How"d you pick that out?"

"Calendar." Peter puffed up a little, smug. "She don"t do the same housekeeping work every day. There"s a Monday schedule and a Wednesday schedule and-well, I found where the pattern didn"t match. And there"s a funny thing-watch this."

He waved vaguely at a display panel. It lit up, showing Dolly in her black-and-white uniform, vacuuming. "House camera," Peter explained. "She"s plugged into Steele"s security system. Like a guard dog with perfect hair. Whoever performed the hack also edited the external webcam feeds that mirror to the companion"s memories."

"How hard is that?"

"Not any harder than cloning over her files, but you have to know to look for them. So it"s confirmation that our perp knows his or her way around a line of code. What have you got?"

Roz shrugged. "Steele had a lot of money, which means a lot of enemies. And he did not have a lot of human contact. Not for years now. I"ve started calling in known a.s.sociates for interviews, but unless they surprise me, I think we"re looking at crime of profit, not crime of pa.s.sion."

Having finished with the nail file, Dolly wiped it on her prison smock and laid it down on Peter"s blotter, beside the cup of ink and light pens.

Peter swept it into a drawer. "So we"re probably not after the genius programmer lover he dumped for a robot. Pity, I liked the poetic justice in that."

Dolly blinked, lips parting, but seemed to decide that Peter"s comment had not been directed at her. Still, she drew in air-could you call it a breath?-and said, "It is my duty to help find my contract holder"s killer."

Roz lowered her voice. "You"d think they"d pull "em off the market."

"Like they pull all cars whenever one crashes? The world ain"t perfect."

"Or do that robot laws thing everybody used to twitter on about."

"Whatever a positronic brain is, we don"t have it. Asimov"s fictional robots were self-aware. Dolly"s neurons are binary, as we used to think human neurons were. She doesn"t have the nuanced neurochemistry of even, say, a cat." Peter popped his collar smooth with his thumbs. "A doll can"t want. It can"t make moral judgments, any more than your car can. Anyway, if we could do that, they wouldn"t be very useful for home defense. Oh, incidentally, the s.e.x protocols in this one are almost painfully vanilla-"

"Really."

Peter nodded.

Roz rubbed a scuffmark on the tile with her shoe. "So given he didn"t like anything ... challenging, why would he have a Dolly when he could have had any woman he wanted?"

"There"s never any drama, no pain, no disappointment. Just comfort, the perfect helpmeet. With infinite variety."

"And you never have to worry about what she wants. Or likes in bed."

Peter smiled. "The perfect woman for a narcissist."

The interviews proved unproductive, but Roz didn"t leave the station house until after ten. Spring mornings might be warm, but once the sun went down, a cool breeze sprang up, ruffling the hair she"d finally remembered to pull from its ponytail as she walked out the door.

Roz"s green plug-in was still parked beside Peter"s. It booted as she walked toward it, headlights flickering on, power probe retracting. The driver side door swung open as her RFID chip came within range. She slipped inside and let it buckle her in.

"Home," she said, "and dinner."

The car messaged ahead as it pulled smoothly from the parking spot. Roz let the autopilot handle the driving. It was less snappy than human control, but as tired as she was, eyelids burning and heavy, it was safer.

Whatever Peter had said about cars crashing, Roz"s delivered her safe to her driveway. Her house let her in with a key-she had decent security, but it was the old-fashioned kind-and the smell of boiling pasta and toasting garlic bread wafted past as she opened it.

"Sven?" she called, locking herself inside.

His even voice responded. "I"m in the kitchen."

She left her shoes by the door and followed her nose through the cheaply furnished living room.

Sven was cooking shirtless, and she could see the repaired patches along his spine where his skin had grown brittle and cracked with age. He turned and greeted her with a smile. "Bad day?"

"Somebody"s dead again," she said.

He put the wooden spoon down on the rest. "How does that make you feel, that somebody"s dead?"

He didn"t have a lot of emotional range, but that was okay. She needed something steadying in her life. She came to him and rested her head against his warm chest. He draped one arm around her shoulders and she leaned into him, breathing deep. "Like I have work to do."

"Do it tomorrow," he said. "You will feel better once you eat and rest."

Peter must have slept in a ready room cot, because when Roz arrived at the house before six a.m., he had on the same trousers and a different shirt, and he was already armpit-deep in coffee and Dolly"s files. Dolly herself was parked in the corner, at ease and online but in rest mode.

Or so she seemed, until Roz entered the room and Dolly"s eyes tracked. "Good morning, Detective Kirkbride," Dolly said. "Would you like some coffee? Or a piece of fruit?"

"No thank you." Roz swung Peter"s spare chair around and dropped into it. An electric air permeated the room-the feeling of antic.i.p.ation. To Peter, Roz said, "Fruit?"

"Dolly believes in a healthy diet," he said, nudging a napkin on his desk that supported a half-eaten Satsuma. "She"ll have the whole house cleaned up in no time. We"ve been talking about literature."

Roz spun the chair so she could keep both Peter and Dolly in her peripheral vision. "Literature?"

"Poetry," Dolly said. "Detective King mentioned poetic justice yesterday afternoon."

Roz stared at Peter. "Dolly likes poetry. Steele really did like "em smart."

"That"s not all Dolly likes." Peter triggered his panel again. "Remember this?"

It was the cleaning sequence from the previous day, the sound of the central vacuum system rising and falling as Dolly lifted the brush and set it down again.

Roz raised her eyebrows.

Peter held up a hand. "Wait for it. It turns out there"s a second audio track."

Another waggle of his fingers, and the cramped office filled with sound.

Music.

Improvisational jazz. Intricate and weird.

"Dolly was listening to that inside her head while she was vacuuming," Peter said.

Roz touched her fingertips to each other, the whole a.s.semblage to her lips. "Dolly?"

"Yes, Detective Kirkbride?"

"Why do you listen to music?"

"Because I enjoy it."

Roz let her hand fall to her chest, pushing her blouse against he skin below the collarbones.

Roz said, "Did you enjoy your work at Mr. Steele"s house?"

"I was expected to enjoy it," Dolly said, and Roz glanced at Peter, cold all up her spine. A cla.s.sic evasion. Just the sort of thing a home companion"s conversational algorithms should not be able to produce.

Across his desk, Peter was nodding. "Yes."

Dolly turned at the sound of his voice. "Are you interested in music, Detective Kirkbride? I"d love to talk with you about it some time. Are you interested in poetry? Today, I was reading-"

Mother of G.o.d, Roz mouthed.

"Yes," Peter said. "Dolly, wait here please. Detective Kirkbride and I need to talk in the hall."