During a break in the member Daubrecq a crime is committed and two accomplices of Arsene Lupin arrested by the police. One is guilty of the crime, the other innocent but both will be sentenced to death. Lupin will seek to deliver the victim of a miscarriage of justice, but must fight against the member Daubrecq unscrupulous blackmailer, who holds a compromising document, hidden in a crystal stopper.
