Anna and Lukas have a happy marriage, but when, in a moment of madness, Anna has a brief fling with Erik, a man she met at a work conference, she lives to regret more than just her infidelity. Erik is a disturbed individual who goes to extreme lengths to get Anna's attention, including kidnapping her ten-year-old daughter and attacking her mother. Before she knows it, Anna's life is in the grip of this psychopathic stalker and she must try desperately to escape his clutches before it is too late.