A wealthy jeweler receives a note warning him of the planned kidnapping of his daughter. To prevent it from happening, the jeweler hires Japan's number one detective Akechi to keep his daughter safe. When the kidnapper is revealed to the cunning jewel thief Black Lizard who is also after the jeweler's “Star of Egypt” diamond, it sets off a battle of wits between Black Lizard and Akechi as each attempt to outsmart the other.