Private investigator Lew Harper is hired by wealthy and imperious Elaine Sampson to find her missing husband, Ralph. Harper, known for his quick wit and relentless determination, delves into Ralph's business dealings and personal life. His investigation leads him to several dubious characters, including a former movie star named Fay, who has fallen on hard times, and a charming pilot named Allan Taggert. Each person Harper encounters presents a new lead but also adds to the complexity of the case as he uncovers layers of deceit and betrayal.

As Harper digs deeper, he discovers Ralph's involvement in shady activities, hinting at possible motives for his disappearance. The clues take him through the underbelly of Los Angeles, from seedy bars to lavish estates, revealing dark secrets and entangling Harper in increasingly dangerous situations. Despite the mounting obstacles and threats to his own safety, Harper remains steadfast in his quest to unravel the mystery surrounding Ralph's vanishing act.