He let them drive away without making any signal to his men. Since he knew where they were going, there was no especial hurry. The cab turned into the drive and headed down-town. Greg joined his expectant men and issued his instructions.

"Frank, you go back to Nina and tell her they're all gone out except the old lady. She must be pretty near distracted by what's happened. She'll be glad enough to have Nina back for company. Tell Nina to go right up-stairs on the pretext of getting her things. Tell her I'm sending in one of my men who will claim to be the piano man, and that she is to let him in and help him. By the way, what is the name of the people who own that apartment?"

"Merriweather."

"Good. Blossom will say that Mr. Merriweather made an arrangement to have the piano inspected monthly. And he can explain the lateness of his call by saying—let me see—I have it! Blossom will say that his baby is going to be christened to-morrow, and he's doubling up his work to-day, so that he can get a day off. Nothing like a little touch of homeliness to make a story carry!"

"I get you," said Frank.

"Blossom, you heard? The little black book was dropped in the top of the piano, and fell down behind the sounding-board. Your job is to recover it. Work quickly, because de Socotra may not be away long. When you get it you're to hustle home, and tell Bessie to put it in a safe place. Oh yes, and take the girl Nina down there with you, and give her in Bessie's care."

"Will Pa wait for me?" asked Blossom.

"No, take the subway home. I need both cabs. Go on with you. Frank will show you the ropes."

Blossom and Frank made their way towards the basement entrance.

To the remaining two Greg went on: "De Socotra has gone to 411 West Eighty-third Street. Pa, you're job is to trail him as before. You're to come west through Eighty-third, and stop a little way beyond 411. Very likely his cab will be waiting for him. You're to follow him wherever he goes and report by telephone through the drug-store at nine o'clock. I'll arrange with the druggist to keep open late. Hickey, you take me through Eighty-third traveling east."