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Lefty Rack, a psychopathic killer, manages to escape from Sing Sing prison. His goal is to take revenge on his former accomplices, guilty, according to him, of having betrayed him. It is the escaped prisoner himself who informs Nick Raider of his intentions by telephone, adding that the last on the list will be himself, the policeman who arrested him. One by one, Lefty's old friends turn up dead. Rack's revenge has begun!