During her hometown's annual Riverfest celebration, Billie is tasked with house-sitting for her aunt and uncle. To pass the time, she enlists the help of her hapless friends, but things go awry when they accidentally stumble upon a dark secret in her teenage cousin's bedroom. While digging deeper into the mystery that resides within Grace's room, they come to find out that they aren't the only ones watching over the house. Now it is only a matter of time before Grace finds out, and she won't be happy when she does.