Separate Lies is a 2005 British drama film directed by Julian Fellowes, who also wrote the screenplay, updating the 1951 novel A Way Through the Wood by Nigel Balchin, which had already been turned into a stage play under the title Waiting for Gillian in 1954. The film stars Tom Wilkinson, Emily Watson and Rupert Everett. Separate Lies marked the directorial debut of Julian Fellowes, who had worked mostly as an actor and won an Academy Award with his screenplay for Robert Altman's Gosford Park.

James Manning is a wealthy London solicitor. Anne, his younger wife, is accommodating and dutiful and likes the life they lead; the house in London, the Buckinghamshire hideaway.

At a village cricket match, Anne meets William Bule, son of a leading local family, who has recently returned from America.

Anne suggests to her reluctant husband that they should have neighbours over for drinks. However, that evening, James has to work late in the city. Before the party is set to begin, a speeding car sideswipes a man bicycling along a village lane. The man is hurled to the ground and dies a few days later. He was the husband of Maggie, the Mannings' housekeeper.

Anne takes a special interest in Maggie's well-being, but James can't understand why. James notices a scratch on Bill's car, which is removed a few days later. James confronts Bill over lunch, accusing him of the collision. Bill initially denies the allegation, but then confesses and promises to tell the police the next day, although he sees no benefit to it.

Back home, James tells Anne about his conversation with Bill. She opposes Bill's telling the police, but James insists justice be done. When Anne reveals she was the one driving the car, James changes his mind. Anne initially claims she had visited Bill to borrow more drinks for the party, but then admits she has been having an affair with him.

A Buckinghamshire police inspector questions the Mannings and Bill about the accident, and James is torn between doing the right thing and maintaining appearances at all costs. James really loves Anne, and the couple take a trip to Wales in an effort to leave the accident, their guilt, and their marital troubles behind. Anne promises to break off the affair, but James catches her continuing it.

Maggie, whose husband was killed, witnessed the accident. She saw the car and identifies it as belonging to Bill Bule. However, the police suspect her testimony may be biased, since Maggie was dismissed from her previous job after Bule accused her of theft. Anne gave her a new start in the village after she hadn't worked for eight years.