Cath Greenstone, her cousin Bea, and her hippie aunt Astrid live in Wonder Falls, a small town near the mystical Niagara Falls. They run the Brew-Ha-Ha cafe, and they're witches hiding in plain sight, along with their three magical cats, Treacle, Peanut Butter, and Marshmallow.

When the Brew-Ha-Ha's baker is burnt to a crisp, along with their beloved cafe, Aunt Astrid lets out a big family secret: a powerful spellbook, a Greenstone heirloom from the Salem days, has been stolen from its secret hiding spot in the cafe. If it's fallen into the wrong hands, black magic could destroy not only Wonder Falls but the world.

A secret society... A new detective with a shady past... A once-bullied local returning to town as a multimillionaire. Who in town would know Cath's family secret? Cath, Bea, and Astrid must use their witch powers to uncover the deadly truth. Their cats can also do magic, and since Cath can communicate with animals, they're able to help uncover more than one secret lurking in wonderful Wonder Falls.