Does your child love thrilling adventures? What if they are also magical? Then this book is just right for them! It is also about THE MOST IMPORTANT THING, which little hedgehog Seryozhik did not know β a hedgehog who grows mandarin seeds and, for a time, is afraid of everything in the world. He will of course grow up to be big and brave, as his Mama told him, but that will not happen for a very long time. Difficult roads, dangerous encounters underground and in the sky β the Path that Seryozhik must travel with a Key and a sword. This is a wise and very kind fairy tale about a dream, friendship, loyalty, and responsibility. And also about how the Key opens all doors, if you correctly answer one single question: "What is the most important thing in the world?" Seryozhik already knows. Do you?