In a small, seemingly quiet town, mother-son duo Charles and Mary Brady hide a dark, horrifying secret. Unlike ordinary humans, they are Sleepwalkers—shapeshifting creatures that survive by feeding off the lifeforce of young women. With their latest move, they set their sights on Tanya Robertson, a high school girl who becomes the unwitting target of Charles' sinister intentions. Charles poses as a charming new student to infiltrate her life. As he grows closer to her, the nefarious nature of their existence starts to unravel through a series of alarming and violent events that quickly draw the attention of the local community and law enforcement.

As Charles and Mary become increasingly desperate to fulfill their needs, they resort to more brutal and overt methods. Their ability to shift from human to monstrous form gives them an edge, but it also makes them increasingly reckless. The tension mounts as the true nature of the Brady family is exposed, leading to a dramatic confrontation that threatens to tear the town apart. Local authorities scramble to piece together the reality of the situation, only to find themselves ill-equipped to handle the horrifying creatures. Amidst growing fear and chaos, Tanya must confront the terror she's unknowingly been drawn into, battling not just for her own survival but for the safety of everyone around her.