The Comfort of Strangers (1981) is a novel by British author Ian McEwan. Set in an unnamed European city that closely resembles Venice, the story follows a British couple, Mary and Colin, as they become entangled in the sadomasochistic sex-games of a local couple.
We meet Colin and Mary as they begin their holiday. Mary is a divorced mother-of-two and a one-time actor, while Colin once dreamed of being a singer. They have been together for seven years, but they aren’t married, and they don’t live together. Although they love one another, their relationship is strained and exhausted. Their sex life has petered out. They spend a lot of time in silence, in part because they each know what the other would say about any given topic. They are both exceptionally good looking, especially Colin.
One night, they set out in search of dessert. Unable to find anywhere to eat, they become lost. As they venture down a deserted street, a local man approaches them and introduces himself as Robert. He wears a golden razor blade on a string around his neck. He invites them to accompany him to a bar. Mary and Colin are reluctant, but Robert is forceful, and they agree.
The bar appears to be a gay bar, with an all-male clientele. It soon becomes clear that Robert is its owner. As he helps Colin and Mary to wine and breadsticks, Robert tells them stories about his childhood, focusing on the abuse he endured at the hands of his wealthy, sadistic father.
Colin and Mary feel unable to leave until the bar closes. Unable to find their way home, they end up sleeping in a doorway. The next morning, they set off in search of somewhere to get a drink, but they can’t find a table. Realizing they are a long way from their hotel, they debate how they will get back, only to be interrupted by Robert. Noticing that they are still wearing last night’s clothes, he apologizes for keeping them up. He invites them to come to his house to sleep and eat. Colin and Mary try to refuse but find themselves unable to do so. Robert hustles them into a cab.
Robert’s home occupies several floors of a dilapidated palazzo. Robert shows them into the guest bedroom, where they sleep.
When they wake, they find that their clothes have been taken away. Mary puts on the single embroidered dressing gown that has been left for them and sets out in search of Robert. Instead, she finds Robert’s wife, Caroline. She is disabled and because she cannot climb stairs, she is effectively trapped in the house. She invites them to dine, and Mary agrees.
That evening, Robert takes Colin to show him some mementos of his father. Suddenly and without any apparent motive, Robert punches Colin in the stomach. Nevertheless, at the end of the evening, when Caroline asks Colin to promise to return, he does promise.
The couple is relieved to get away from the house, and when they get back to their hotel, they feel rejuvenated. They spend several days in bed together, feeling closer than they have in years.
They return to their exploration of the city, with no intention of returning to Robert and Caroline’s home. However, they arrive there by accident and find themselves once again invited in.
This time, Robert separates Colin from Caroline and takes him to his wine bar. On the way, he addresses a dozen men in the local dialect. When they get to the bar, Robert explains that he was telling them that Colin is his lover.
Meanwhile, Caroline explains that she and Robert are locked in a sadomasochistic affair. Robert abuses her so violently during sex that he once broke her back, resulting in her present disability. However, Caroline does not object to this treatment. She defines herself as a masochist and insists to Mary that all women are intrinsically masochistic. Finally, she confesses to Mary that she and Robert share a mutual fantasy of killing another person during sex.
Caroline makes tea and takes Mary through the house to the bedroom she shares with Robert. The walls are covered with photographs of Colin, most taken from a distance. At that moment, Mary realizes that Robert and Caroline intend to kill her partner, but as she does so, she begins to feel physically heavy. She collapses onto the bed. Caroline has drugged her with a substance that paralyzes her physically but leaves her conscious and able to see.
Soon Robert returns with Colin. To Colin, Mary appears catatonic. Robert tells him that she will die unless Colin complies with his wishes. Colin agrees and Robert and Caroline begin to undress and kiss Colin. Unable to move or speak, Mary watches as Robert slits Colin’s wrist with a razor blade. She passes out.
When she comes around, she learns that Colin is dead. Robert and Caroline have disappeared, taking all the couple’s possessions. The police inform her that crimes like this happen all the time.