After 300 years of slumber, three sister witches are accidentally resurrected in Salem on Halloween night, and it is up to three kids and their newfound feline friend to put an end to the witches' reign of terror once and for all.

Every six hundred years, a great evil has the opportunity to escape and unleash Armageddon. A group of five stones has the power to either free the evil, or banish it for another six hundred years. An order of Druids battles with a Warlock determined to unleash his father upon the world.

Jack and Annie are young siblings who find a magic tree house on their way home after chasing a weasel. By using the books available on the tree house, they are able to travel through time and location. The two end up with the difficult task of collecting four medallions, each one hidden in a different place and epoch, in order to help a magician named Morgan.