Arsène Lupin decides to run a detective agency in addition to being a gentleman thief. As a detective he happens to cooperate with police in order to unveil the criminal activities of a villain.
The plot follows Conan Edogawa who sets out to apprehend Arsene Lupin III, the suspect of stealing a jewel called Cherry Sapphire.
A Mexican version of the Arsene Lupin character, with Sherlock Holmes tossed in as a cameo at the end.