En busca de la bruja plateada (Una amistad monstruosa, 3)

Is friendship enough to save a whole town? Polly and Buster have always believed that witches and monsters can be friends, but it seems no one else agrees. While the witches are furious and the monsters are rebelling, an even greater threat looms nearby. Can Polly and Buster unite everyone in time to save their town? The thrilling conclusion to the critically acclaimed Monster Friendship trilogy.