In 1949, the Japanese imperial capital was divided into two classes with a huge gap between the rich and the poor, and the rich held privileges. Among them, a mysterious face-changing thief K-20 emerged, often stealing rare treasures from the wealthy class. That day, he claimed that he would steal the famous painting "Tower of Babel" from a certain consortium on the wedding day of the consortium's daughter, Hashiba Yoko (played by Takako Matsu), which caused great panic in the police department. Yoko's fiancé, Inspector Akechi Kogoro (played by Tôru Nakamura), was on high alert as if he was facing a great enemy. The acrobat Endo Heikichi (played by Takeshi Kaneshiro) with special skills was involved in the conspiracy to steal the painting. Because he was mistaken for K-20, he was thrown into prison, but later escaped by chance. With the help of his old friend Genji, he lived among the people, devoted himself to studying the art of disguise, and prepared to take revenge on K-20 who framed him. Yoko always played with the gift given to him by his father before his death, thinking that there was a mystery hidden in it. Later, K-20 appeared again and prepared to kidnap Ye Zi. At the critical moment, Endo Heiyoshi arrived. The two of them dealt with K-20 and the National Police Agency and gradually approached the truth... This film is adapted from the novel of the same name by Edogawa Ranpo.