My desk was a nightmare—an altar to all the work I hadn’t done over the last few days. It was amazing how quickly your academic future could crumble. A week or two and you were totally out of step. I might as well have missed the entire year. I might as well have never come to Wexford. Of course, now I had bigger things to worry about, but I allowed myself a few minutes of panic to take in the enormity of how screwed I was, Ripper stuff aside. It was almost like a mental vacation from the stress of the ghosts and the sight and the murders.

The dark came fast, and I had to switch on my desk light. Then I heard people getting up and going to dinner. It was already five. I had no appetite, but I had to get out as well. I wasn’t staying here by myself. When I got outside, Callum was gone and the police car had taken his place. Stephen sat in the driver’s seat. He waved me over and opened the door. As soon as I got in, he drove around the corner, away from the prying eyes of people going to dinner.

“It’s time to go over the plan for tomorrow,” he said. “It’s very simple. You stay at Wexford. We’ll cover the building at all times. Boo’s well enough to come. She can’t walk, but she can be here, in a wheelchair. She can keep her eyes open. Tomorrow morning, I search your building from the top down. I’ve got special permission from the school. Once we’re sure it’s clear, you stay inside your building all night, with Boo. I’ll be at the front of the building, and Callum will be at the back. He won’t be able to get in without one of us seeing him. You’ll never be alone, and you’ll never be undefended. And you’ll have this.”

He held out a phone—specifically, Boo’s phone, which was the same low-tech model they all carried. This one still had the white scratch marks on the black plastic from when it had skidded across the road after Boo’s accident.

“I know you know what this is,” he said.

“I have no idea what you’re talking about,” I replied.

“I followed you two,” he said simply. “I saw you go into Bethnal Green station, and I saw your reaction when you emerged.”

“You followed . . .”

“Callum’s wanted to tell you from the start,” he said. “I probably would have ended up telling you if he hadn’t. I had a feeling it was going to happen. But now that you do . . .”

He held up the phone. “It’s called a terminus. Terminus means end, or boundary stone.”

“It’s a phone,” I said.