Famous crime novelist Harlan Thrombey was found dead in his sumptuous estate on the evening of his 85th birthday. With a sharp mind and a debonair appearance, Detective Benoit Blanc is then hired by an anonymous sponsor to solve the case. But between Harlan’s family, who are tearing each other apart, and his staff, who remain devoted to him, Blanc plunges into the meanders of an eventful investigation, mixing lies and false leads, where the twists and turns follow one another at a frantic pace until the very last minute.