The Intruder is a 1999 psychological thriller directed by David Bailey from a screenplay by Jamie Brown, based on the novel of the same name by Brooke Leimas.

It stars Charlotte Gainsbourg as a woman who suspects she is being stalked, possibly by her husband's first wife, who was murdered three years ago.

In a police station, a blood-splattered woman named Catherine confesses to killing her husband's first wife earlier that day.

Jealous and enraged, Stella describes in her diary how she gets revenge on the suspected mistress by destroying her possessions, though the evidence always disappears before she can present it to Nick.

After Daisy and Charlie both die under suspicious circumstances, Catherine borrows Badge's pistol, a new model imported directly from Germany.

Back in the police station, Catherine is booked and about to be given a psychiatric evaluation when she remembers that the murder weapon, Badge's pistol, can be easily traced.

[3] Robert Pardi of TV Guide rated it 1/4 stars and wrote that the film's focus on suspense over characterization causes viewers to have nobody with whom they can identify when the plot becomes confusing.