Isadora has a wobbly tooth and her mum and dad are more excited about it than she is! Her vampire dad can’t wait to take her to the vampire dentist and have her special little fang framed. Her mum wants Isadora to leave the tooth under her pillow for the tooth fairy. Isadora isn’t sure what to do until one night, she meets a very special, magical mouse called Mignonette. With Mignonette’s help, Isadora will make her own new tradition.