"The Mystery of Grimlyav" is a book in the genre of an adventure novel for children and teenagers, written by Daniel Handeland. It revolves around three orphans who search for their lost family and encounter a series of mysterious events and darkness. The main characters find themselves in a watery and slippery underwater cave - Ominous Grimlyava. The author successfully keeps the reader in suspense, revealing the secrets of the place and characters in the course of the story. "The Mystery of Grimlyav" is an exciting and mystical story that will not leave indifferent any connoisseur of adventure books.