Battle of Boodicuttup Creek

Leanna, Shane and Mitch are shocked when Charlie Buckle and Jem Gasper dam the creek. It will stop the flow of water to the pool where an injured cormorant and other birds live.
They organize a petition.
Is there magic in Uncle Rolly’s bullroarer? Will a mysterious Great Goanna be of help or hindrance How will Shane and Mitch avoid a fight with the Gasper boys?
Suitable for 7-11 year chilren