All winter, as is known, Moomintroll hibernates — and in this he is no different from any other Moomintroll. But in spring, upon waking, he is quite willing to undertake something unusual. For example, climb a mountain with his friends Snufkin and Sniff and discover a forgotten black top hat at the summit. And it turns out this is not just a beautiful hat, but a hat capable of working wonders! With its help, one can defeat the Ant Lion and ride on pretty little clouds, but there is one problem: you never know what the hat will do next. Maybe it’s best to get rid of it? But, as it turned out, this is not so simple. And the main magic will begin when the true owner of the hat arrives in Moominvalley... The book you hold in your hands is a real event. For the first time in many years, the entire Moomin series has been newly translated into Russian! Those already familiar with the residents of Moominvalley will find it interesting to look at their adventures anew. And those whose first encounter with Tove Jansson's fairy world is yet to come can only envy them.