During a fun space detective adventure, the Ukrainian frog Dreamko, along with his friend the brave captain Quaker from the planet Zelin help the Cosmo-cats pirates reduce weight by establishing healthy diets for them. They find themselves among the incredible nano-plants of Professor Kvankus, and reveal the secret of the disappearance of the first planet of Cosmo-frogs, called Avak-37. They also help to solve the ecological disaster that happened on that planet. The book uses tricks of "Fairytale Therapy" which was taught by the author. The book is very good and funny, it teaches children mutual support, the importance of a healthy diet and respect for the environment.