Identical twins Jane and Catherine Gracey are known as the weird kids. Mocked and misunderstood for their love of the strange and the unusual, they only have each other to feel less alone. That is until they meet a friendly witch named Mrs. Macabre, who takes them to a world filled with monsters and where every day is like Halloween. But something from Mrs. Macabre's past is haunting their adventures. Something that could mean great danger to them both.