“More speculation?”

“Yes,” Banks admitted. “Let’s assume they got into a fight over something or other and Luke ended up dead. Maybe not intentionally, but dead is dead. They panicked, thought of a suitable spot and drove out and dumped him into Hallam Tarn later that night, under cover of darkness.”

“They’d need a motor, remember, which might be a bit of a problem if they were broke.”

“Maybe they ‘borrowed’ one?”

“We can check car-theft reports for the night in question. No matter how much they covered up the body, there might still be traces of Luke’s blood.”

“Good idea. Anyway, they know who Luke’s parents are, think they might be able to make a few bob out of them.”

“Which would explain the low demand.”

“Yes. They’re not pros. They’ve no idea how much to ask. And ten grand is a bloody fortune to them.”

“But they were watching Martin Armitage make the drop, and they saw me.”

“More than likely. Sorry, Annie. They might not be pros, but they’re not stupid. They knew the money was tainted then. They’d already dumped Luke’s body, remember, so they must have known it was just a matter of time before someone found it. They could expect the footpath restrictions to work in their favor for a while, but someone was bound to venture over Hallam Tarn eventually.”

Annie paused to digest what Banks had said. She had made a mistake, had scared the kidnappers off, but Luke had already been dead by then, so his death wasn’t down to her. What else could she have done, anyway? Stayed away from the shepherd’s shelter, perhaps. Red Ron was right about that. She had guessed that the briefcase contained money. Did she need to know exactly how much? So she had behaved impulsively, and not for the first time, but it was all salvageable—the case, her career, everything. It could all be redeemed. “Have you ever thought,” she said, “that they might have planned on kidnapping Luke right from the start? Maybe that was why they befriended him in the first place, and why they had to kill him. Because he knew who they were.”

“Yes,” said Banks. “But too many things about this seem hurried, spontaneous, ill-thought-out. No, Annie, I think they just took advantage of an existing situation.”

“So why kill Luke, then?”

“No idea. We’ll have to ask them.”

“If we find them.”

“Oh, we’ll find them, all right.”

“When the girl sees her picture in the paper she might go to ground, change her appearance.”

“We’ll find them. The only thing is…” Banks said, letting the words trail off as he reached for another cigarette.

“Yes?”

“That we need to keep an open mind as regards other lines of inquiry.”

“Such as?”

“I’m not sure yet. There might be something even closer to home. I want to talk to a couple of teachers who knew Luke fairly well. Someone should talk to the Battys again, too. Then there’s all the people we know he came into contact with the day he disappeared. Put a list together and get DCs Jackman and Templeton to help with it. We’ve still got a long way to go.”