Seeking shelter from a storm, abandoned young cat Thunder sneaks into a mysterious mansion owned by retired magician Lawrence. The magician shares his fairy-tale world with many animals and a dazzling array of automatons and gizmos. He soon makes Thunder feel welcome, but Jack the rabbit and Maggie the mouse start plotting to get him kicked out. However when the house becomes under threat its ragtag inhabitants develop a spooky strategy to defend their home using Thunder as their secret weapon...