Linda, an aspiring actress, takes on a babysitting job on Halloween night, looking after a mischievous boy named Christopher at the swanky home of his parents, Joan and David Carruthers. Unbeknownst to Linda, David's career as a successful stage magician and his seemingly wholesome family life mask a tense reality. Janet, harboring her own ambitions, has had David committed to an asylum months earlier under dubious pretenses. As she prepares to attend a lavish Halloween party with her new partner, she assures Linda that Christopher is a handful but just excitable.

The night begins innocently enough, but Christopher's antics become increasingly troublesome as he stages elaborate and sinister pranks on Linda. He seemingly revels in the chaos he creates, heightening Linda's anxiety. Meanwhile, unbeknownst to them, David manages to escape the asylum and sets out to return home, driven by a yearning for vengeance and clarity. As the night progresses, Linda struggles to keep things under control, realizing that Christopher's tricks aren't the only danger lurking around the house. This tension-filled Halloween night unravels into a twisted game of cat and mouse that holds sinister truths and hidden agendas in its wake, as real threats begin to emerge from both inside and outside the house.