One Hour Photo (2002)

Robin Williams has one of his finest dramatic roles in this offbeat thriller about a lonely, psychologically disturbed photo developer, who becomes obsessed with the family of one of his regular customers, and turns dangerously unhinged when he learns that there is a dark side to the family's seemingly picture-perfect existence. This premise makes for a gripping and effective character study and suspense thriller, building an understated but deeply unsettling tension through Williams' pathetic efforts to ingratiate himself with the family, though it runs out of steam during the last half hour or so. Williams' performance is at once chilling and heartbreaking. Good supporting performances by Connie Nielsen, Michael Vartan, and Gary Cole as Williams' unsympathetic boss.