Desperate for some extra money to cover for her mother's costly chemo-therapy treatment, without a second thought, young Alison takes a late-night job as a babysitter. As Alison enters the mysterious vacant mansion believing that this is going to be an easy and ordinary babysitting night, muffled, yet dreadfully alarming sounds from the infant's monitor upstairs will turn the session into a revolting experience from the bowels of hell.