A Scotsman abruptly breaks off his engagement to pretty Kitty and moves to his uncle’s castle in the Scottish highlands. Kitty and her aunt follow Gerald a few weeks later, and discover he has suddenly aged. Some mysterious things happen in a maze made from the hedges adjoining the castle.

A young scientist’s experiment goes awry when he creates a monster from a radioactive isotope and finds that the creature consumes energy to grow in size and terrorize the nearby town.