The Stepsister

Emily's new stepsister, Jessie, has moved in and immediately made her life a misery. Jessie takes over Emily's room, wears her clothes, and lies to their parents. When Emily discovers Jessie's diary, she uncovers a terrifying secret that suggests Jessie might be capable of murder. With no one believing her, Emily must find a way to expose Jessie before she becomes the next victim.