Once upon a time, just outside a village surrounded by green fields, there was an ancient Slavic forest. It was full of singing birds, old trees and fragrant flowers. In this forest lived Zosia, a cheerful little girl with a storm of chestnut hair. Zosia's best friend was a little wolf named Srebrzyk. Although Srebrzyk was still a puppy, he could already smell adventure a mile away! One sunny morning, Zosia and Srebrzyk went in search of the first spring flowers. They ran among the ferns, played hide-and-seek and laughed to the echoes. Suddenly, Srebrzyk stopped by an old, mossy pine tree and started to squeal. - 'What have you got there, Silver? - Zosia asked, crouching down beside him. There was an egg lying among the leaves. It was slightly larger than a hen's, had a shiny blue shell, and on it were patterns resembling tiny leaves and flowers. Zosia had never seen an egg like this before. It was warm, as if someone had just left it. - Look how beautiful! - Zosia whispered. - Maybe it belongs to some forest bird? The silverfinch sniffed the egg carefully and cried quietly, as if it sensed something very important. At the same moment there was a quiet noise between the trees, as if someone was walking slowly through the dry leaves. Zosia held her breath and Srebrzyk hugged her leg. Who or what could be approaching them in the middle of the forest grove? Zosia squeezed the egg tighter and looked deep into the dark forest....