Robin Scott's apartment is burglarized and bugged by a clever gang of swindlers, headed by Fred Caine, an unscrupulous private eye, and Jack Hayes, who looks and talks like Robin. Caine and his confederates accomplish an ingenious $200,000 swindle. Then to prevent any possible exposure, they kidnap Robin and take over his apartment. Although Robin is left to die in his car trunk, he manages to survive and is rescued. He sets a trap for the gang. They fall for his bait--a half-million dollars worth of jewels--and he traps them. Caine and another swindler, Oscar Bradley, meet accidental death in the process.