The book "The Inscrutable Gentleman" was written by the American writer John Phillips Marquand. This is a novel that combines detective and psychological literature. The main character, psychologist and private detective Hugh Ennell, investigates the mysterious disappearance of a young girl in elite American society. Gradually, he unravels the threads of a complex story, uncovering secrets related to the girl's admirers and her past. In this intense investigation, you will have to face cunning criminals, as well as your own demons. "The Inscrutable Gentleman" is a book that will captivate the reader with its intrigue, analysis of psychological portraits of characters and unexpected turns of events.