A woman calls 911 to report an intruder in her home. Having already hanged the man of the house with a noose, serial killer Hangman instructs the woman to say she loves him before violently stabbing her.

Hangman secretly records Aaron Miller, his wife Beth, their daughter Marley, and young son Max as they embark on vacation at the Burbank airport. Once they leave, Hangman breaks into the Miller family’s minivan and uses the vehicle’s GPS to drive back to their house. There, Hangman watches their home movies, installs hidden cameras, establishes a surveillance suite in the attic, and begins secretly living inside the Miller home.