The Crystal Stopper by Maurice Leblanc is a thrilling Arsène Lupin mystery involving a high-stakes robbery, a political conspiracy, and a mysterious crystal ornament. As Lupin investigates a secret hidden within the crystal stopper, he uncovers dark secrets linked to powerful figures. The novel combines suspense, wit, and social critique, with Lupin’s trademark cleverness and charm at the center of the action. Leblanc’s storytelling weaves intrigue and elegance into an unforgettable adventure.