Magic, Mystery and Girl Power! When birds begin disappearing from the forests around Witchborough, the girls will need to use all their knowledge, and a little magic, to solve the mystery. But along the way they face a hitherto unknown threat to their coven when their grimoire is stolen - and it begins to look like one of the girls might have to leave, forever. This is a middle-grade academy series: Cassie's Coven: The Case of the six-legged frog Cassie's Coven: The bad apples mystery Cassie's Coven: The bye bye birdy mystery Cassie's Coven: The abalone ring mystery