In 1868 an innocent girl was sent away and put to death for witchcraft. Her mother, the true Witch of Willow Branch, swore revenge upon the entire town. Grandma Bertie warned Gus and Molly of the Legend and they discover that someone has resurrected the witch's curse and the town of Willow Branch is about to pay for its past. In order to save their mother from certain death, Gus and Molly find themselves in the middle of Willow Branch's greatest unsolved mystery as they come face-to-face with their worst nightmare while they search for a way to forever end the Curse of the Jack O' Lantern.