The Cassie’s Coven series is based around four young Australian girls who discover that they have been left a magical heritage from their great-great-grandmothers to become witches.
They find out over the series that they are each a special kind of witch; black, white, green and yellow—each with their own powers and all aimed at protecting the natural world.
Each mystery they solve revolves around some kind of environmental issue which has the potential to wreak havoc on their small town.
The first book introduces the characters, has them find a magical book, meet their familiars and solve their first mystery.
As the series goes on they become more proficient in their powers, find out the background of their town and their ancestors and solve mystery after mystery.