Oscar-winner Susan Sarandon (Thelma & Louise, Dead Man Walking) goes head to head with Emily Blunt (Mary Poppins Returns, The Devil Wears Prada) in this startling mystery-thriller, as a woman consumed by the thought that one of her husband's pretty co-workers is out to take her children, her spouse and her identity. As her obsession manifests, she turns stalker herself in an effort to prove her sanity, but is about to discover something more shocking than she'd ever dared imagined.