“Be so good,” requested the Colonel, “as to give me the names of all your guests.”

He produced a sheet of paper from his portfolio and placed it on the piano. The Colonel wrote the names down as Doctor Svetilovitch gave them. When the doctor stopped short the Colonel asked laconically:

“All?”

“Doctor Svetilovitch answered as briefly:

“All.”

“Show us into your study,” said the Colonel.

They went into the study and rummaged among everything there. They turned over all the books and disarranged the writing-table. They looked through the letters. The Colonel demanded:

“Open the bookcases, the bureau drawers.”

Doctor Svetilovitch answered: “The keys, as you see, are in their places in the locks.”

He put his hands into his pockets and stood by the window.