Grace passed the Outside Enquiry Team office on his left, a large room where detectives drafted in on major incidents would base themselves for the duration, then a door on his left, marked sio, which would be the temporary office he would move into for this enquiry. Immediately opposite was a door marked mir one, which he entered.

MIR One and MIR Two were the nerve centres for major incidents. Despite opaque windows too high to see out of, One, with its fresh white walls, had an airy feel, good light, good energy. It was his favourite room in the entire headquarters building. While in other parts of Sussex House he missed the messy buzz of police station incident rooms that he had grown up with, this room felt like a powerhouse.

It had an almost futuristic feel, as if it could as easily have housed NASA Mission Control in Houston. An L-shaped room divided by three principal workstations, each comprising a long, curved desk with space for up to eight people, it contained massive whiteboards, one marked Operation Cormorant, one marked Operation Lisbon, one Operation Snowdrift, each covered in crime-scene photographs and progress charts. And there was a new one, fresh as of yesterday afternoon, labelled Operation Nightingale, the random name the Sussex Police computer had thrown out for the dismembered torso investigation.

Unlike the workstations in the rest of the building, there was no sign at all of anything personal on the desks or up on the walls in this room. No pictures of families or footballers, no fixture lists, no jokey cartoons. Every single object in this room, apart from the furniture and the business hardware, related to the matters under investigation. There was no banter, either. Just the silence of fierce concentration, the muted warble of phones, the clack-clack-clack of paper shuffling from laser printers.

Each of the workstations was manned by a minimum team of an office manager, normally a detective sergeant or detective inspector, a system supervisor, an analyst, an indexer and a typist. Grace knew most of the faces, but people were too busy to be distracted by the niceties of greetings in here.

No one looked up as he walked across to his own team except for Detective Sergeant Glenn Branson, six foot two inches tall, black and bald as a meteorite, who greeted him with a raised hand. He was dressed in one of his customary sharp suits, today a brown chalk-stripe that made him look more like a prosperous drug dealer than a cop, a white shirt with a starched collar, and a tie that looked like it had been designed by a colour-blind chimpanzee on crack.

‘Yo, old timer!’ Glenn Branson said, in a voice loud enough to cause everyone in the room to look up for a moment.

Grace glanced down at the rest of his eight core team members with a brief smile. He had taken most of them straight from his last case, which meant they hadn’t had much of a break, if any, but they were a good bunch and had worked well together. From years of experience he had learned that if you had a good team, it was worth keeping it intact if at all possible.

The most senior was Detective Sergeant Bella Moy, cheery-faced beneath a tangle of hennaed brown hair, an open box of Maltesers, as ever, inches from her keyboard. He watched her typing in deep concentration, every few moments her right hand moving from the keyboard as if it were some creature with a life of its own to pluck a chocolate and deliver it to her mouth. She was a slim woman yet ate more than any human being Grace had ever come across.

Next to her sat Detective Constable Nick Nicholl, in his late twenties, short-haired and tall as a beanpole, a zealous detective and a fast football forward who Grace was encouraging to take up rugby, thinking he would be perfect to play in the police team he had been asked to be president of this coming autumn.

Opposite him, reading her way through a thick wodge of computer printout, was rookie DC Emma-Jane Boutwood. A pretty young woman with long blonde hair and a perfect figure, Grace had initially thought her a lightweight when she had first joined his team on the last case. But she had rapidly proved herself a feisty officer, and he had a feeling she had a brilliant future in the force, if she stayed.

‘So?’ Glenn Branson said. ‘I’ve changed my hunch. How do I convince you my new hunch is right? Teresa Wallington.’

‘Who she?’ Grace asked.

‘A Peacehaven girl. Engaged. Never turned up to her engagement party last night.’

The words twisted something cold deep inside Grace. ‘Tell me.’

‘I spoke to her fiancé. He’s real.’

‘I don’t know,’ Grace said. His instincts told him it was too soon, but he did not want to dampen Glenn Branson’s enthusiasm. He studied the photographs of the crime scene on the wall, which had been rushed through at his request. He looked at a close-up of the severed hand, then the grisly shots of the butchered torso in the black bag.

‘Trust me, Roy.’

Still looking at the photographs, Grace said, ‘Trust you?’

‘There you go doing it again!’ Branson said.

‘Doing what?’ Grace asked, puzzled.

‘Doing what you always do to me, man. Answering with a question.’

‘That’s because I never understand what the hell you are on about!’

‘Bulllllll-shit!’

‘How many missing women do we have who are not yet eliminated?’

‘No change from yesterday. Still five. From a reasonable radius of our area. More if we include nationwide.’

‘No word from the lab on the DNA yet?’ Grace asked.

‘Tonight, by six o’clock, they hope they’ll know whether the victim is on their database,’ DC Boutwood interjected.

Grace glanced at his watch. Fifteen minutes then he needed to go straight on to the mortuary. He did some quick mental arithmetic. According to Frazer Theobald’s best guess in the field yesterday, the woman had been dead for less than twenty-four hours. It was not uncommon for someone to go AWOL for one day. But two days would start causing real concern among friends, relatives and work colleagues. Today was likely to be productive in at least establishing a shortlist of who the victim might be.

Addressing DC Nicholl he said, ‘Have we got a cast of the footprints?’

‘It’s being done.’

‘Being done is not good enough,’ Grace said a little testily. ‘I said at this morning’s briefing I wanted two officers out with casts, going round outdoor clothing stores in the area seeing if there’s a match. Chances are someone bought boots for the occasion. If they did, they may be on a CCTV camera. There can’t be that many stores that sell heavy-duty boots in the area – make sure I have a report for our sixty thirty p.m. briefing.’

DC Nicholl nodded and immediately picked up his phone.

‘It’s the second day she hasn’t contacted him,’ Branson pressed.

‘Who?’ Grace said distractedly.

‘Teresa Wallington. She’s living with her fiancé. There doesn’t sound like any reason why she failed to turn up.’

‘And the other four on our list?’

‘None of those have been seen today either,’ he admitted grudgingly.

Although thirty-one, Branson had only been a cop for six years, after a somewhat false start in life as a nightclub bouncer.

Grace liked him a lot; he was smart and caring, and he had great hunches. Hunches were important in police work but they had a downside – they could lead officers to jump to conclusions too quickly, without properly analysing other possibilities, and then subconsciously select evidence to fit their hunch. Sometimes Grace had to curb Branson’s enthusiasm for his own good.

But at this moment it wasn’t just Branson’s hunch on the case that Grace needed him for. It was on something distinctly extracurricular.

‘Want to take a drive to the mortuary with me?’

Branson stared at him with raised eyebrows. ‘Shit, man, is that where you take all your dates?’