"The Secret of the Lake" is a book by the author duo of Dana and Marvin, which mesmerizes readers with its tense atmosphere and unexpected turns of events. The main characters, Jane and Tom, accidentally come across an old castle near a picturesque lake, where they decide to spend their vacation. However, a quiet trip quickly turns into a thrilling detective novel when they begin to investigate the disappearance of a local resident. Readers, together with the characters, will solve riddles, unfold events and reveal deeply hidden secrets, which makes this book an exciting journey through the world of secrets.