The boys decided this was good advice, particularly as they were getting chilled, for the halls were draughty. They donned some clothes, and were all ready when several bluecoats and a number of detectives in plain clothes arrived. "Where'd they get in?" asked a big man, with a very black moustache. "Let's see what sort of a job it was." "Right in here," said the hotel manager, leading the way to where the boys roomed. "From all accounts this was the only place he broke into." "Didn't really lose anything, did you?" asked the black-moustached one of the boys. "He got a valuable card," said Jack. "I would not like to lose it." "What do you mean, a playing card; one you carried for luck?" "No, I don't carry such things for luck," replied Jack. "It had a message on it." He described the queer bit of pasteboard Mr, Liggins had given him. "Oh I see; it was a sort of charm," interposed the detective with the light moustache. "Well, we'll make a round of the pawnshops tomorrow. Maybe we'll locate it." "I don't believe so," said Jack, half to himself. "It's not a thing that would be pawned." The boy felt that Professor Punjab would be very likely to keep the card, thinking it might be some mysterious talisman, which could be used to advantage in his peculiar line of work. So Jack had little faith in what the detective said. There was nothing more for the police or detectives to do. No trace of the thief was to be found, and, after a general look around, the officers departed and the hotel settled down to normal quietness. The boys went back to bed, but it was some time before they fell asleep. Jack dozed uneasily, wondering how he was going to regain possession of the card which Professor Punjab had stolen. "You ought to be thankful it wasn't our money, which it would have been, only for John," said Nat next morning. "Penetrating peanuts! When I think of what might have happened I shudder," and he gave an imitation of a cold chill running down his back. "It's bad enough," said Jack. "Of course we need the money, but we could get more on a pinch. We can't get another card like that, though, and we may need it very much. At least I will." "Let's go to the police and make them find it," suggested Nat. "They'll never find it," put in John, who sat in a chair with his head bandaged. "We'll have to depend on ourselves." The robbery, and John's slight wound, necessitated a change in their plans. They wired to Mr. Kent, Nat's uncle, that they would be delayed. Then they arranged to stay several days in Chicago. The hotel proprietor insisted on sending a physician, to see the Indian. The medical man prescribed a rest, and, while John stayed in his room his chums paid several visits to the police. Jack impressed them with the value of the card, and the detectives really made efforts to find it, and to arrest the "professor," but without result.