Arsenio Lupin is an audacious Parisian thief who mocks the police especially Inspector Ganimard but turns over most of his illgotten gains to charity One night he attends a party disguised as a newspaper writer who also mocks Ganimard the next morning the hosts wife and a male guest are found murdered and Ganimard arrives to solve the crime A Mexican version of the Arsene Lupin character with Sherlock Holmes tossed in as a cameo at the end