Mike Hammer investigates the mysterious murder of a red-haired prostitute whom he met by chance at a bar just a few hours before her death. He starts his investigation in the alleys of the slums and continues through the mansions of millionaires, in glittering nightclubs, and in the alluring half-light of apartments. The trail he follows is marked by blood and violent death. The investigation will end only when Mike corners the killer—where only one person will come out alive.