Yet Michael never so much as thought of not keeping the appointment. His business was to find Sam, and it mattered as little to him now that danger stood in the way as it had the day when he flung his neglected little body in front of Starr Endicott and saved her from the assassin’s bullet. He would go, of course, and go alone. Neither did it occur to him to take the ordinary precaution of leaving his name and whereabouts at the police station to be searched for in case he did not turn up in reasonable time. It was all in the day’s work and Michael thought no more about the possible peril he was facing than he had thought of broken limbs and bloody noses the last hour before a football scrimmage. There was something else in the letter that interested Michael and stirred the old memories. That old whistle! Of course he had not forgotten that, although he had not used it much among his college companions. It was a strange, weird, penetrating sound, between a call and whistle. He and Buck had made it up between them. It was their old signal. When Michael went to college he had held it sacred as belonging strictly to his old friends, and never, unless by himself in the woods where none but the birds and the trees could hear, had he let its echoes ring. Sometimes he had flung it forth and startled the mocking birds, and once he had let it ring into the midst of his astonished comrades in Florida when he was hidden from their view and they knew not who had made the sound. He tried it now softly, and then louder and louder, until with sudden fear he stopped lest his landlady should happen to come up that way and think him insane. But undoubtedly he could give the old signal. The next night at precisely ten o’clock Michael’s ringing step sounded down the alley; firm, decisive, secure. Such assurance must Daniel have worn as he faced the den of lions; and so went the three Hebrew children into the fiery furnace. “It’s him! It’s the angel!” whispered old Sal who was watching. “Oi tould yez he’d come fer shure!” “He’s got his nerve with him!” murmured a girl with bold eyes and a coarse kind of beauty, as she drew further back into the shadow of the doorway. “He ain’t comin’ out again so pretty I guess. Not if Sam don’t like. Mebbe he ain’t comin’ out ’tall!” “Angels has ways, me darlint!” chuckled Sal. “He’ll come back al roight, ye’ll see!” On walked Michael, down the alley to the narrow opening that to the uninitiated was not an opening between the buildings at all, and slipped in the old way. He had thought it all out in the night. He was sure he knew just how far beyond Sal’s house it was; on into the fetid air of the close dark place, the air that struck him in the face like a hot, wet blanket as he kept on.