L'Aiguille creuse

A burglary at a Norman château, a wounded thief who vanishes, and a scrap of paper covered in signs: Isidore Beautrelet, a seventeen-year-old schoolboy, takes up the case where the police have failed. He soon understands that Arsène Lupin is behind it, and that the paper hides the secret of the Hollow Needle, a hiding place guarded by French kings for centuries. The duel between the student and the gentleman burglar runs from Normandy to Paris and back. A detective novel with twists until the last page.