The case of the six-legged frog — Helen Allan

Four young girls, one magic book and a whole lot of mysteries to solve.When 10-year-old Cassie Delaware finds an old spell book and her best friend, Lolly, finds a six-legged frog they have no idea they are about to enter a magical world. Joining forces with two unlikely allies they must solve a mystery that has the potential to destroy their small town. This is a middle-grade academy series:Cassie's Coven: The Case of the six-legged frogCassie's Coven: The bad apples mysteryCassie's Coven: The bye bye birdy mysteryCassie's Coven: The abalone ring mystery