"You have nothing more to tell us?" he queried.

"Nothing!"

"Then we need not trouble you further tonight. Of course, if luck
favors us and we find the gentleman with the classical features-- the
most unlikely person to commit a murder I have ever heard of-- we
shall want you to identify him."

"I am at your service at any time. But before you go won't you
enlighten me somewhat? What did really happen? I have not even seen a
newspaper account of the crime."

"Would you care to examine No. 17?"

It was Furneaux who put the question, and Theydon was genuinely
astonished.

"Do you mean--" he began, but Furneaux laughed, almost savagely.

"I mean Mrs. Lester's flat," he said. "The poor woman's body is at the
mortuary. If you come with us we can reconstruct the crime. It
occurred about this very hour if the doctor's calculations are well
founded."

Theydon rose.

"I shall be most-- interested," he said. "By the way, Mr. Furneaux,
yours is a French name. Are you a Frenchman, may I ask?"