The bye bye birdy mystery — Helen Allan

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 frogCassie's Coven: The bad apples mysteryCassie's Coven: The bye bye birdy mysteryCassie's Coven: The abalone ring mystery