The day after his 85th birthday, wealthy novelist Harlan Sloanby was found to have committed suicide in his own manor, leaving behind hundreds of millions of inheritance. The prestigious detective Blanc (Daniel Craig) was suddenly hired by an anonymous person to investigate the truth of the case. At the same time, Harlan's grandson Lanson (Chris Evans) is also secretly investigating the case. When Blanc talked to other members of Harlan Sloanby's family, he found that things were not as simple as he imagined. The Harlan family is not as harmonious as it seems. Everyone has a secret that cannot be told, and everyone wants to get the inheritance... Is this murder a suicide or a homicide? It seems that everyone is a suspect. With the unexpected appearance of an heir to the inheritance, the truth gradually surfaced...