In "The Crystal Stopper," Arsène Lupin finds himself pitted against a formidable adversary named Jacqueline Beaumont, who is the daughter of a famous poisoner. Jacqueline seeks revenge for her father's imprisonment and intends to use a deadly poison called "the crystal stopper" to eliminate those responsible. As Lupin becomes aware of Jacqueline's plans, he sets out to thwart her and protect her potential victims.The novel combines elements of mystery, suspense, and clever intrigue as Lupin matches wits with Jacqueline Beaumont. Maurice Leblanc's storytelling expertise shines through as Lupin unravels the dangerous plot and engages in a battle of intellect with his adversary."The Crystal Stopper" is a captivating addition to the Arsène Lupin series and is recommended for fans of detective fiction and thrilling adventures.