In this book you will learn about the new adventures of our hero; he has grown older and finished first grade. His parents took him to his grandparents for the entire summer holidays. Now Gleb is not the only one who has a four-legged friend named Marty. The holidays will be amazing and unforgettable. One day, while out for a walk, Marty will run away from Gleb and he will find his friend in the magical forest. There, fabulous adventures await them, which will be both dangerous and fun. They will help out both fairy-tale heroes and ordinary children, with whom they will make friends and together defeat all the villains.