Three men had broken into the laboratories of Atomic Power Inc., killing three guards and stealing a new formula for the control of atomic fission. They had inside help: someone had given them the guard schedule and a plan of the laboratories. The one substantial clue was that the spy cameras had caught the thieves, and one of them had forgotten to shield his face. Across his forehead was the dark streak of an indelible brand: the debtor's mark Private investigator Jim Carter knows that mark well, but what he does not know is that by accepting the case, he has already marked himself for death Six great science fiction crime and suspense stories from a master storyteller.