The story of a resilient woman's fight to reclaim her freedom even as she risks her own sanity.

Still scarred from the trauma of being terrorised by a stalker, Sawyer Valentini (Claire Foy) receives treatments at the Highland Creed Behavioral Centre. However, shortly after she unwittingly commits herself to the mental institution and is unable to leave, she catches sight of a facility staffer who, she is convinced, is actually her stalker. But is he real or a product of her delusion?