Mademoiselle Stangerson, the daughter of a famous scientist, was attacked in her home. The doors and windows of her room were locked from the inside, but the villain entered the room and then disappeared, as if he had disappeared into thin air. 18-year-old reporter Joseph Rouletabille dares to unravel this case, challenging detective genius Frederic Larsan. (“The Mystery of the Yellow Room”) Three applicants for a seat at the French Academy die under strange circumstances. Will it be possible to punish their killer, whose weapons are not a knife and a pistol, but ultra-rays, smells and a deadening song? (“The Enchanted Chair”)