Plot: Sophie Hartley is convinced that she is being stalked. She becomes increasingly certain that her husband's beautiful co-worker, Mara, wants her children, her husband and her life. But no one believes Sophie. Forced to prove her sanity, Sophie grows increasingly paranoid - but is she imagining things? Sophie becomes completely caught up in her obsession, turning stalker herself - and makes a discovery more frightening than her worst fear.
Alternative Plot: When objects start to go missing from her home, Sophie Hartley (Susan Sarandon) suspects that a stalker is responsible. Then she meets Mara (Emily Blunt), the new co-worker of her husband, Craig (Sam Neill), and after seeing her in a dress that was among the vanished items, Sophie believes that Mara is obsessed with her. Unfortunately, she takes her suspicions too far, which leads to legal ramifications and her husband becoming concerned for her well-being -- but also to a startling discovery.
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