"The Mystery of the Hatifnatts" is an exciting children's book by the Swedish writer Tuva Jansson about the mysterious creatures - the Hatifnatts, who live in the Moomin-dolu forest. They move silently, sometimes it seems as if they do not exist at first glance. One day, the main characters - restless Moomin and his friends - decide to find out who Hatifnats are and why they are always looking for something. But will they be able to reveal it, or will the mystery remain a mystery forever? The Secret of the Hatifnats book is an exciting adventure that teaches children about friendship, self-belief and the importance of understanding and accepting difference. Thanks to bright illustrations and funny dialogues, the book will become a favorite of both young readers and their parents.