A butterball's bosom was no more impervious to slough water than the rapt-eyed youth to the older man's irony. "When I opened his parcel I found it held mortar and stone and some steel cuttings." "And this led you to infer?" "This led me to follow him. He had a basement, I found, directly in the rear of a bank building." "What bank building?" "That's my story."