The Treatment

Fourteen.

The 'barracudas' the ten-year-olds, just the age they started to be trouble were showing off. They made Fish Gummer uncomfortable.

"Can we do a trick now?"

"Yeah, let's do that trick thing."

"No, no." He checked the big clock at the far end of the steamy pool. "I think we're finished now it's gone half past."

"Yeah, let's do that." A muscular Nigerian girl in a lemon-yellow swimsuit was jumping up and down excitedly. "Let's do that thing where we swim through your legs."

"Absolutely not."

"The other teachers let us do it."

"I don't care."

"You get in the pool and we swim through your legs '

"Underwater '

"Yeah like mermaids '

"No, I don't think so."

Three of them slithered towards him at the edge of the pool, their wet, glowing little faces smiling up at him. "We hold our breath like this A head disappeared under the water.

"Yes yes yes!" a girl in pink squealed, throwing an exuberant backward roll in the water.

"No!" He was getting anxious. The remaining two had reached the pool edge and were giggling uncontrollably.

"That's it," giggled another. "We all hold our breath." She pinched her nose and disappeared into the water.

"And you put your legs open and we swim through them '

Now he saw a little hand come out of the water, groping for his ankle. "No!" He wrenched his foot away and fumbled for the whistle on the tape around his neck, a look of rigid fear on his face. "Just stop!" he said. "I said no. Absolutely no." The hand subsided and all the children flicked up their legs like dolphins and came to the surface, spluttering and shocked. They stared at him in stunned silence, getting their breath back, not knowing how to react.

Then, suddenly, at the back of the group, the Nigerian girl clamped her hand over her mouth and began to snicker. It spread quickly and soon they were all laughing. All of them looking at him and giggling. He wanted to turn and run into the changing room. Now they knew how to upset him, and he knew it wouldn't end here.

By the end of the day nothing was moving. The teams came back in dribs and drabs, dropping the completed Actions forms into Kryotos's tray. They'd give verbal reports at the day's meeting, but Caffery, sitting in the SIO's room watching them through the glass, already knew from their faces that no one had any new leads. He sighed and sat back, lighting another cigarette. His stomach was tight he hadn't eaten and the day had been long and exhausting and dry. Champ's nickname for his attacker had passed into the local folklore, but none of the children could give the police more than the myth, nothing concrete. Caffery had Brixton send the photographs of Champ Keoduangdy's bite over to King's, hoping Ndizeye, the forensic odontologist, could establish if the person who had bitten Champ at the boating-lake more than twelve years ago was the same person who had inflicted the mark on Rory Peach. Ndizeye had completed Rory's casts "An adult-sized arch and the incisors look smooth, so he's over twenty. Great clear casts. Teeth can be as individual as DNA, you know." But, no matter how individual the teeth were, Caffery knew that what they really needed was some DNA. And then at four thirty Kryotos came in with a smile on her face.

"Fiona Quinn on the line," she said, jabbing her finger at the phone. "The DNA's back."

He snatched up the phone and stood looking out of the window. "Fiona." He desperately needed to hear what she had to say. He wondered how his voice sounded. "How are you?"

"I'm OK, Jack, but I've got bad news. It's come back no profile."

"No profile?"

"No profile."

"Shit." He sat down again, deflated.

"But, Jack, at least eighty per cent of our samples come back this way, no or partial profile. It's really fragile, DNA."

"I know you told me that already. I just thought…" He sighed. Without DNA they couldn't start a mass screening all they had to work with were Ndizeye's casts. "Fuck, fuck, fuck. Haven't we got anything else to go on?"

"Well, I've had a look at that corner of the room Alek Peach was talking about in his statement '

"And?"

"Nothing so far."

"The white fibres from Rory's wounds?"

"Nothing yet. But that'll come. And we're still looking at his shoe, trying to see if there's anything on that. Then there's the stuff the biologists sprayed on the wall, the ninhydrin in a couple of days we'll see how that's developed but with the witness statements you got we're groping in the dark, to be honest. And even if his prints are all over the place there's no guarantee the ninhydrin will pick it up. Keep your fingers crossed your man is a meat-eater if he's a veggie we won't get anything."

"OK, OK." He closed his eyes. His head was beginning to hurt as if he'd come off a drinking spree. "And absolutely nothing you can do with that semen sample?"

"Um – I'm not sure."

He opened his eyes. "I beg your pardon?"

"I said I can't say for sure."

"Jesus." He whistled between his teeth. "I don't believe this." In the incident room Souness and Paulina had come back. He could see Paulina's right foot where she was sitting, dangling in mid-air, with its expensive sandals and nails painted in shell pink tapping in a lazy rhythm. He turned away.

"Listen," he said to Quinn, 'it's more than two days since the PM and now you turn round and tell me you can't '

"There's no need to '

"It's a good job we haven't got someone sitting here under arrest or we'd look a right bunch of tits."

"You're not listening."

"I paid to have it fucking premiumed. If you think that means I was prepared to sit around for days and then get a phone call saying we might do it, we might not, we might just sit here and paint our nails '

"Jack"

"then I wouldn't have bothered to pay through the nose. This fucking SGM, plus stuff you're all crowing about, two K a pop, why don't you just admit it's a great, infested, steaming pile of crap '

"Mr. Caffery!"

"Wha-at?"

They both stopped. Caffery locked his mouth and tapped his foot on the floor. He could almost see the pair of them, pawing the ground, red-eyed, snorting across London at each other. He knew he'd raised his voice and he sensed Kryotos was watching him from the incident room, and suddenly he saw himself through her eyes volatile, unreasonable, sliding at a hundred miles an hour. He took a deep breath, leaned back, rapped on the desk with his knuckles, and said: "Yes, look, I'm sorry. What?"

"Have you heard of LCN? Low count number?"

"No."

"It can multiply the sample thirty-four times. It's only approved for major crime '

Then do it. You've got our lab cost code it should have already been started."

"That's what I was trying to say. It has been. It's already been started."

The envelope was on the doormat when he came in. The conversation with Fiona Quinn had finished him for the day. He had lost his temper with her you just can't help proving Rebecca right, can you? and had left Shrivemoor early, knowing he should just go home and sleep. He drove to Sainsbury's where he bought four bottles of Pinot Grigio on sale, a bottle of Laphroaig, a carton of Coke bottles, milk and some Nurofen. Just before he left the shop he saw a bunch of sage green leaves mixed with peonies. He hesitated then bought two bunches. For Rebecca.

Now he picked up the letter and took it into the kitchen. He put it on the table, then stood for a moment and stared at it. It had a second-class stamp on it. It had been posted on Wednesday afternoon and was from Penderecki he could tell from the writing. Maybe posting this had been the last thing he had ever done.

Caffery emptied the carrier-bags, stopping from time to time to go back to the table and look at the envelope. He carefully put one bottle of wine in the freezer, another in the fridge, looked through the cupboards for a vase, and when he couldn't find one took a plastic lemonade bottle from the bin, cut off the top, peeled away the label and filled it with water. He put the flowers in it, rested it on the window-ledge in the living room, rolled himself a spliff using the sensi that Rebecca kept in the Oxo tin, and then, when he could bear it no longer, he lit the joint, sat down at the table and opened the envelope.

It contained just one sheet of paper. There was no need for a note or explanation. The single sheet of paper told him everything he needed to know. It was a map.