The Crystal Stopper is a thrilling Arsène Lupin mystery where the gentleman thief must save his associate, Gilbert, from the guillotine after a robbery at the home of Deputy Daubrecq goes wrong. The stakes rise when it is revealed that a crucial piece of evidence—a list of politicians involved in a scandal—is hidden inside a mysterious crystal stopper, leading Lupin into a dangerous game of blackmail, murder, and deception against the cunning Daubrecq