On the shores of Lake Tanganyika lies the idyllic Serole Lodge, internationally famous for the study of chimpanzees. In the summer of 2016, it plays host to a group of travellers including academics, film stars and Hiram Sidewinder, an infamous game-hunting dentist from Tennessee, with his family. It should be a visit to paradise. But in the dark forest a bloody revolution is taking place among the chimpanzees, led by the fearsome Dump, a psychopathic murderous ape who has brutally usurped the position of alpha male. As Dump's power grows, he threatens the existence of the lodge and the lives of all within it. In the middle of a tropical storm, the confrontation reaches an inevitable and terrible climax...