When a routine babysitting job goes terrifyingly wrong, high school student Kelly Ferguson, played by Tamara Smart, is plunged into a hidden world of supernatural danger in this fantastical family adventure. Her young charge is snatched by the malevolent Grand Guignol, a boogeyman with a sinister plan, forcing Kelly to team up with a secret society of monster-hunting babysitters led by the experienced Oona Laurence. Guided by a mysterious handbook and with the help of unlikely allies, including the enigmatic Tom Felton, Kelly must overcome her own fears and embrace her unexpected destiny. This thrilling quest blends humor with chills as the group navigates a night filled with bizarre creatures and dark magic, racing against time to save not just one child, but all children from a monstrous fate.