Lost Worlds is the long-awaited continuation of Anton Farutin's fantasy series "Arsants", which took first place in the ratings of Apple, Storytel, Akniga and the most prestigious competitions. But be careful - this book opens the darkest pages of human history! The disappearance of Jack Stone forces his friends to devote all their efforts to searching for him. To do this, they will have to explore the secret archives of the Guardians, unravel the mystery of the Bermuda Triangle, use an ancient spatial portal and find themselves in the world of Shadows. However, what the heroes learn during their search forces them not only to rethink the structure of the world around them, but also to understand themselves, their motives and feelings.