The story happened in August 1939. Eight people who didn't know each other in different parts of the world received a letter from the Owens at the same time. The letter warmly invited them to visit the Soldier Island near the coast of Devon, where the couple owned a very luxurious villa. Soon, the eight people set off, but when they arrived at the island, they were told that the Owens were not at home, and they were received by two housekeepers on the island. In this way, the eight people entered the villa one after another in excitement and confusion. During dinner that night, a phonograph in the restaurant suddenly sounded, and a mysterious voice began to accuse the eight people present, claiming that they had all committed murder. What's worse, it wasn't long before the first victim appeared.