Nick and Nora Charles, a witty and sophisticated couple known for their detective work, find themselves inadvertently drawn into a new mystery while enjoying a day at the racetrack with their young son Nicky. The mysterious death of a jockey turns the carefree outing into an investigation as Nick, though retired from his detective career, gets intrigued. Nora, ever his enthusiastic partner, insists they unravel the crime together. Their involvement deepens when police urge Nick to help, aware of his renowned sleuthing past. As the investigation ensues, they gather clues and interview a variety of quirky suspects connected to the racing circuit.

Accompanied by the dependable Lieutenant Abrams and their trusty dog Asta, Nick and Nora delve into the tangled web of deceit surrounding the racetrack. Their adventure leads them through glamorous nightclubs and seedy underground scenes, exposing layers of corruption, gambling rings, and hidden relationships that complicate the case. Light-hearted banter and clever deductions mark their progress as each suspect adds another twist to the crime. The interplay between the charming duo and colorful characters unfolds with humor and suspense, yet beneath the surface humor lies a race against time to prevent further crimes. As they parse out truths from innuendos, Nick and Nora edge closer to revealing the identity of the true mastermind behind the jockey's death.