The Good People always choose the most beautiful, sweetest children. If the Good People likes a child, don’t expect mercy! So Thomas, Molly’s brother, was dragged straight from the cradle, and in his place they left a scary, thin and constantly screaming baby. Molly's mother went to the witch, and she advised her to take care of the foundling as if she were her own son. And then (maybe!) the Good People will take pity and return Thomas. What to do, Molly began to help her mother and even gave the foundling a name - Guest. All he did was cry, bite and eat a lot. And then Molly went into the forest in search of the Good People, taking with her the Guest, of course. Molly decided to exchange the Guest for Thomas at any cost. She will have to confront the terrible creatures serving the Good Folk, find allies among the vagabonds, and even reveal the darkest secret of the Good Folk! And who knows whether she will have the strength to bring Thomas home...