When Elspeth arrives at the fiftieth birthday party of her ex-husband, the famous British film director Richard Bryant from whom she has been estranged for 10 years, she expects a crowd in his sprawling LA mansion. Instead, there are only eight other people, and Richard’s pet octopus Persephone, floating dreamily in a wall-sized aquarium. By the morning, Richard is dead. All of the guests are suspects. As she is interviewed by the police, Elspeth pieces together her memories of the party that evening. She also remembers her marriage, her early film career, and the consuming power of a monstrous man.