About the book: 2005 / Quina's father and son (one of whom is a senior criminal police professional, and the other an amateur detective with unique intuition) solve the murder of a lawyer in a Broadway theater based on a single clue - a missing silk top hat ("The Mystery of the Disappearing Hat"), as well as the murder of a famous scientist, famous for his sensational experiments on the separation of Siamese twins ("The Mystery of Siamese Twins"»).