Polly and Buster series: Book 3

Is being best friends enough to save a whole town?? 

Polly and Buster have always believed that witches and monsters can be friends, but no one else agrees. 

While the witches are furious and the monsters are in uproar, a much gretaer menace lurks nearby. Can Polly and Buster bring everyone together in time to save their town?