“Why do you say ‘ if he killed her’? It’s been proved she didn’t kill herself; it’s been proved that no one could enter the house without a latchkey, and it’s been proved that the deed was done in that one hour between half-past ten and half-past eleven. So it had to be Mr. Carleton.”

“Miss French, you have a logical mind, and I think you’d make a clever little detective. But you have overlooked the possibility that she was killed by someone in the house.”

“Some of us?” Kitty’s look of amazement almost made Fessenden smile.

“Not you or Miss Gardner,” he said. “But a burglar might have been concealed in the house.”

“I never thought of that!” exclaimed Kitty, her eyes opening wide at the thought. “Why, he might have killed us all!”