It only took an hour of searching the tape before he spotted the victim’s car arriving in the lot. He paused on a single frame and wrote down the licence plate on a brand new silver Mercedes SUV. He called it through and within a few minutes he was looking at the victim’s ID. She was called Amy Lloyd-Gardner, and she was twenty-four years old. A quick check on the various databases showed she was a PR executive married to a wealthy young banker.

Tom pulled up a photograph of Amy Lloyd-Gardner from a social networking website and leaned back into his seat. He stared at her face. She was another beauty with long blond hair, similar in looks to Mary-Jane and Grace. The killer was fixated on a certain kind of look and this was his trigger: a bright-eyed, blond-haired innocence.

Harper turned round to look at the room full of officers working methodically through the case details. Somewhere out in the city, Amy’s husband was waiting up for her, as yet unaware that his young wife was a murder victim.

She had been on a lazy afternoon shopping trip. She would’ve had no idea as she wandered around the shops that there was a killer tracking her and waiting for an opportunity. No idea at all. Her car, her clothes, her shopping had all disappeared. That meant that the killer had taken everything away in the silver Merc. But the killer didn’t take the body and he didn’t need to take the clothes. He wants to keep the clothes, Harper thought, and added it to a growing list of the killer’s predilections. He called across to one of the detectives and asked him to get the car details sent out to the team and called through to patrol. Within minutes, the car’s plate and description was radioed all across Manhattan and New York State. Finding the big shiny car was just a matter of time.

Harper walked through to Williamson to give him the heads-up on the ID. Williamson took the printout. ‘Thanks, Harper. Listen, I’ll take Garcia and go and see Mr Lloyd-Gardner myself. Shit, what a night call this is going to be.’

Harper was pleased that Williamson would take this one. He needed more time to go through the information from the crime scene. When he returned to his desk, his email blinked with a new arrival, from the guys at the crime scene lab. Harper had requested the photographs as soon as they’d been downloaded and categorized. He clicked through the images one by one. The story retold itself on his computer screen. A sad end to life in a grey concrete garage. The violence of the poor woman’s end was there before him in cold close-up. He felt the anger rising and took a moment to detach himself.

He clicked backwards and forwards through the pictures of the corpse. From a certain angle, the naked body with the skin stretched out either side of her torso looked like some kind of butterfly. Was that accident or design? He stared at the screen. Amy’s toenails were painted red, and there was a little black ace of spades on her left hip. Her eyebrows had been plucked thin and then drawn in pale eyebrow pencil, and her lips still retained a translucent pink lip gloss. Even on a mutilated corpse, the little marks of recognition and individuality demanded to be known. Harper noticed a mark just below her lips. Smudged lipstick. Maybe the killer had left a print. He zoomed close to her lips, until they covered the entire screen. It wasn’t a fingerprint. A faint outline of a kiss lay half across her lips in her own lipstick. The killer must have kissed her, coated his lips in her lipstick and then kissed her again. There was a half-print of the killer’s lips sitting right there.

He gave Latent Prints a call and suggested they get a print. Everything needed to be processed, every tiny detail. He never knew, down the line, what would help him nail this bastard and get him locked up. Sometimes it was a single hair, sometimes a significant coincidence, sometimes a cell phone call that put the killer at the scene, sometimes something as simple as a kiss.

What were they dealing with? A sociopath? A thrill seeker or a sexually sadistic serial killer who wouldn’t stop until someone stopped him? The team didn’t talk much as they wandered in and out of the precinct late into the night. Not even the jokes were flowing yet, just the grim sense of a difficult journey and the knowledge of how much pain and suffering these victims had been through.

Harper picked up the congealed dinner of chicken noodles that had been half eaten a few hours earlier. He was halfway through the first mouthful when he caught the image again in his mind’s eye.

Harper moved back to his desktop and clicked on her photographs again. The hands in prayer, he was thinking. That little detail from Grace Frazer’s murder was sitting right there in Harper’s mind and the link to the parking lot killing flashed into his mind. He found the image he wanted. The woman’s corpse was shining bright. Her skin was so pale it was almost iridescent, the wings were blood-dark, and the fluorescent lights glistened gold on the bloody circle around her head.

Harper stopped mid-chew. A halo?

Yes, he knew that there was something in that image, something that connected it to Grace Frazer. The killer had started to express himself, let himself be known a little. First a woman with her hands in prayer and now he’d made wings and a halo. Amy looked like an angel with her heart torn out.

Harper was fired by the thought and quickly printed three photographs, one of Mary-Jane Samuelson, one of Grace Frazer and one of the Angel. He went up to one of the big boards that had been set up in the investigation room and pinned the pictures side by side. Garcia looked across from the computer he was working at. ‘What you looking at, Harper?’

‘He’s signing his corpses.’

Harper picked up his coat and walked down the stairs. He needed some fresh air and a chance to think. A killer’s MO was one thing - it was what he needed to do to kill - but an MO could change, as it had in this case. He had cut them to different degrees, but the signature was what he needed to do to fulfil himself, what he couldn’t kill without doing. The angelic wings and the hands in prayer were part of a ritual, just like the cherry blossom, which struck Harper as almost bridal. The killer needed to pose his corpses like dead angels. Harper felt that he knew something about the killer now. He hated goodness and religion. Like a devil, he needed to degrade it all.

Harper stepped across the street towards a coffee shop. It was close to midnight. Outside, the air was good and cool. The winter migrants who had stayed in New York would appreciate the break from the harsh cold wind. Harper’s footsteps echoed in the quiet night air. Then he spotted a guy up ahead staring at him.

Harper turned and behind him saw two more big guys walking towards him. All three were over six foot and burly. They looked like security guards, or maybe even police.

‘I guess this isn’t social, so what do you want?’ Harper said, cold-eyed.

‘Into the alley,’ said one of the guys. His face looked like the side of a mountain.

‘Read the shield, gentlemen,’ said Harper, flashing his ID. ‘I’m a cop, so you might want to avoid trouble and get yourselves home to bed.’

They didn’t move, but looked down into the dark alley. Harper thought they were motioning for him to make a move, but from the alley he heard footsteps. His eyes twisted towards the sound and he saw the problem. Its name was Lieutenant Jarvis, and everything suddenly clicked into place.

Jarvis’s jaw was no longer wired up but his face was still misshapen down one side. ‘Detective Harper,’ he said in a slow slur. ‘I thought your police time was over. Now someone tells me I’ve got to eat humble pie while you get the glory spot. After you leaping on me with those fists of yours, doesn’t sound fair, does it?’