In this gripping psychological thriller, Emma, a young graduate student, moves to New York City for a fresh start after a painful break-up. But when a stalker hacks into her electronic devices and begins watching her through her cameras, Emma's illusion of privacy is shattered. As the stalker's obsession grows, Emma's world begins to unravel, and she becomes increasingly paranoid. With her sense of security fragile, Emma must confront the stalker and confront her own fears. Will she be able to reclaim her privacy and her life, or will the stalker's grip on her become too strong to escape?

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Some movies that have similar genres and were produced around the same time as Ratter include Stoker, The Shallows, Black Swan, Run, 10 Cloverfield Lane, Don't Listen.