A family gathering goes horribly awry when the patriarch dies, and two detectives are sent to investigate. Harlan Thrombey, a crime novelist, is found dead in his home on his 85th birthday. A curious investigative detective, Benoit Blanc begins to take part in the murder investigation in secret. Harlan Thrombey’s family is called for an investigation, but the family is literally useless. Blanc seeks to scrape what is visible on this surface and uncover all the lies and find the truth behind Thrombey’s death.