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.

本を読むことが好きで勉強には自信があるが内気な兄ジャックと、人間でも動物でもすぐに友達になれる元気いっぱいの妹アニーは大の仲良し。ある日、いつものように森に遊びに出掛けた2人は、森の中で木の上に乗った不思議な小屋を見つける。何とそれは、好きなときに好きな場所に時空を超えてタイムスリップできる魔法のツリーハウスだった。