Arsène Lupin - Le Bouchon de cristal by Maurice Leblanc.
Arsène Lupin discovers a mysterious crystal stopper, which then disappears. What has happened to it? What is it hiding? In this adventure, Lupin’s adversaries are extremely powerful and some make fun of him. But the celebrated gentleman thief has a few aces up his sleeve. Above all, though, he must hurry to save the life of Gilbert, his young accomplice.
Paperback, 80 pages and audio and activities.