The Comfort of Strangers by Ian McEwanRead about the other entries on the list.
Always a master of psychological ambiguities in relationships — and a perennial favorite of mine — McEwan here depicts a friendship gone horribly wrong. When we meet vacationing lovers Colin and Mary, their relationship has turned stagnant. The heat and passion return when they meet another couple — until their new friends take them to a chilling and violent place.
The Comfort of Strangers is among Jean Hanff Korelitz's six best books about failed marriages, five books that changed Evie Wyld, Kate Kellaway's top ten fictional holidays, and John Mullan's ten best visits to Venice in literature.