Following a break-in, Scott and Mara decide to install a deluxe home security system and give their new nanny all of the pass codes. With the codes, the nanny torments the couple by controlling the smart home's system from her laptop.

When Kristen decides to take a break from college and return home, she finds Jake, a handsome stranger, living in her old room. Her mother, Moira, explains that she invited Jake to live as a tenant to help with the house expenses. Soon, Kristen discovers not only are Jake and Moira sleeping together, but Jake has a secret, dangerous past.