Wealthy, successful crime novelist Harlan Thrombey celebrates his 85th birthday with his family. But at the party, he argues with just about everyone over money, business, or other things. Later, he's found with his throat slit, and children Linda, Richard, Walt, Joni, and Ransom are among the suspects. Master detective Benoit Blanc is called in to solve the seemingly impossible case. The key to the mystery, Blanc realizes, lies with Marta, who was Harlan's nurse and caretaker and who has a condition that causes her to vomit whenever she tells a lie. The reading of the will sends a shockwave throughout the family, and Blanc finds his final, elusive clue when the murderer prepares to strike again. - Common Sense Media