Abbey Dwyer is a popular student in her senior year at Richardson High. After the bizarre murder of her favorite teacher Kendra, she is replaced by Alice, a substitute teacher. Her mother Judy starts her own investigation and she soon unveils Abbey's new teacher's mysterious and dark past, but Alice is one step ahead in her evil plan. When Abbey goes missing and the police find the evidence against Alice too circumstantial, it is up to Judy to find a way to stop Alice and save her daughter.