The Comfort of Strangers is a 1981 novel by British writer Ian McEwan. It is his second novel, and is set in an unnamed city (though the detailed description strongly suggests Venice). Harold Pinter adapted it as a screenplay for television in 1990 (The Comfort of Strangers), which starred Rupert Everett, Christopher Walken, Helen Mirren and Natasha Richardson. The film is set in Venice.
Mary and Colin are an English couple on holiday abroad in an unnamed city. Mary is divorced with two children; Colin is her angelically handsome lover who has been with her for seven years. Although they do not usually live together, their relationship is deep, passionate and intimate, but they seem to be bored.
One evening, the couple gets lost amongst the canals and is befriended by a forceful native named Robert, who takes them to a bar. Later, he insists on bringing them to his house where they meet his wife Caroline. Although the guests are at first shown great hospitality, it becomes clear that the hosts have a peculiar relationship with each other – Robert is the product of a sadistic upbringing and Caroline, who is disabled, has an uncomfortable masochistic view of men as being masters to whom women should yield.
While the two men talk with the women in another room, Robert punches Colin in the stomach hard enough that he doubles over. At their next meeting, Robert takes Colin for a long walk in the city and talks entirely to men, all in a language that Colin doesn't understand. Later, Robert tells Colin that he told the men that Colin was his lover.
Returning to the house, Mary and Colin find that Caroline and Robert have packed all their belongings. They are going away, traveling.
She gives Mary tea laced with a drug that paralyzes her but leaves her able to see. Robert slits Colin's neck, and he bleeds to death while she watches helplessly. She later awakens in the hospital and finds out that Robert and Caroline are gone.
The police later inform her that such crimes are common.
McEwan's novel explores the desultory closeness that exists between Mary and Colin. They have known each other for seven years and "often forget that they are two separate people". As well as being an expression of their love, this closeness makes them weak and puerile. It causes them pain, and enables Robert to take advantage of them.