“Dark Numbers” is an exciting detective novel by Matthias Zenkel, in which the author masterfully intertwines criminal intrigue with mathematical puzzles. The main character investigates a series of mysterious crimes where the key to the solution lies in numerical sequences and ciphers left by the perpetrator at the crime scenes. The book immerses the reader in a tense investigative atmosphere, where every digit can become a decisive clue. Zenkel creates an intellectual detective story that demands the reader’s attention to detail and logical thinking, while simultaneously developing a dynamic and captivating plot.