“The trouble is,” observed Fleck, “that Dean is getting infatuated with the girl. A young man in love is not a keen observer. Anything she thinks she has seen he’ll be ready to swear to. I hope the girl keeps her head. Lovers don’t make good detectives.”

“I have watched them together,” said Carter. “I’ll admit he’s struck on her, but I don’t think she cares a rap for him. She’s too keenly interested in Frederic Hoff.”

“What do you mean by that?” asked the chief sharply.

“You can depend on her all right. She’s patriotic through and through. She’s the kind that would do her duty, no matter what it cost her. All I meant is that Hoff’s the type that interests women. He’s got a way about him. The fact that he’s a spy, in peril most of the time, gives him a sort of halo. I never knew a daring young criminal yet that didn’t have some woman, and often several of them, ready to go the limit for him. All the same, I’m sure we can trust Miss Strong.”

“We’ve got to,” growled Fleck, “for the present at any rate. Is everything fixed for the search this afternoon? What have you done to get the superintendent out of the way? He’s not to be trusted. His name is Hauser.”

“I’ve got him fixed. Jimmy Golden, my nephew, who has helped us in a couple of cases, is a lawyer. He has telephoned to Hauser to come to his office this afternoon.”

“Suppose he doesn’t go?”

“He’ll go all right. Jimmy ’phoned him that it was about a legacy. That’s sure bait. Jimmy will make Hauser wait an hour, then keep him talking half an hour longer. That will give us plenty of time.”

“Then there’s the woman—the servant, Lena Kraus.”

“She goes to the roof every Wednesday while the Hoffs are away to signal. Other days they apparently do the signalling themselves in some way we haven’t caught on to yet. She always goes up about three o’clock and—”