After leaving the city for a quiet life in the country, depressed Robert (Paddy Considine) begins spying on a lovely neighbor, Jenny (Julia Stiles), who may be more dangerous than she seems in this unsettling thriller based on a Patricia Highsmith novel. Surprisingly kind to her stalker, Jenny ingratiates herself into his life and Robert falls for her, angering her volatile boyfriend (James Gilbert) and provoking violent consequences.