Sinister 2 follows a single mother and her twin sons who move into a rural farmhouse that is haunted by the ghostly children from the previous film. As they uncover a series of chilling home movies, they realize it's not just a ghostly presence they have to worry about, but a sinister supernatural entity that possesses the children, driving them to commit acts of violence. A private investigator and a determined deputy also join the hunt to stop the evil spirit before it's too late.

A true crime writer moves into a new home and discovers a box of super 8 home movies. As he watches the films, he realizes they are snuff movies depicting families being murdered. He investigates the murders and learns about a demonic figure named Mr. Boogie who is responsible for the killings. As he delves deeper into the mystery, he realizes that his own family is in danger and must find a way to stop Mr. Boogie before it's too late.