“That’s the point I’m interested in,” I said. “Where did he wait?”

“He said he’d wait outside somewhere, and come back after you’d gone.”

“Did he?”

“What?”

“Come back after I’d left?”

“Yes. Within less than a minute.”

She saw the expression on my face. “What’s the matter? What are you scowling about?”

“I was trying to think back,” I said. “As I remember it, there’s only one string of apartments in that building. It’s over a storeroom, and the corridor runs the length of the building, with apartments on both sides, isn’t that right?”

“Yes.”

“There are no bends or crooks in the corridor where a man might hide?”