| Director | Randal Kleiser |
|---|---|
| Box office | $5 million |
Recent college graduates and high school sweethearts Michael Pappas and Cathy Featherstone, a young American couple, spend their summer vacation at a rented hillside villa on the Greek island of Santorini. When they visit a nude beach crowded with other young tourists, Michael explores a nearby cave and notices a young woman sunbathing topless, with whom he exchanges glances. The next day, using binoculars, he spots the same woman standing outside a villa across the hill. Later, on his way to buy groceries, Michael runs into the woman and proceeds to follow her around the town.
Meanwhile, Cathy takes up photography and builds a darkroom in the bathroom. Despite being widely perceived as a "goody two-shoes", Cathy shares her sexual fantasies with Michael. Guided by a book of sexual techniques, she ties him to the bed and drips candle wax on his chest. While driving alone in town, Michael encounters the mysterious woman—Lina, a French archaeologist on temporary assignment at the nearby Akrotiri excavation. The two take a bus to the beach, where they skinny-dip before having sex in a secluded cave.
Overcome with guilt, Michael admits his infidelity to Cathy but insists that he loves her. Upset, Cathy storms off after telling him to "get it out of [his] system", which he takes as permission to return to Lina. That night, while Michael and Lina resume their affair, Cathy goes to a local bar intending to sleep with another man as revenge for Michael's indiscretion. She meets a young Greek man who takes her to his house, but she flees as he attempts to kiss her. When Michael comes home in the morning, Cathy is still angry at him.
Cathy goes to Lina's villa to confront her, but Lina assures Cathy that she does not intend to steal Michael away from her, while explaining that she has come to Greece to escape her complicated life. As the three of them start spending time together, Cathy is initially jealous seeing Michael and Lina together, but soon grows closer to Lina and agrees to take photographs of her excavation. The women confide in each other about their conservative parents, as well as Lina's past relationships, and Lina encourages Cathy to take more risks in her life.
One evening, Cathy encourages Michael to kiss Lina in front of her, and the three subsequently spend the night together. As Lina moves in with Michael and Cathy, they embark on a three-way relationship. Michael and Cathy throw a surprise birthday party for Lina, who tearfully laments the imminent end of their relationship once her American lovers return home. The next morning, Cathy's mother Jean and her friend Barbara arrive for a surprise visit and later take the trio to dinner. Although Jean struggles to understand the trio's relationship, Cathy assures her mother that she has never been happier in her life.
Uncertain about her future with Michael and Cathy, and afraid of getting hurt, Lina distances herself from them and begins dating Jan Tolin, a young man she met at the beach. As Lina disappears, Michael and Cathy search for her but eventually conclude that she does not want to be found. Unable to enjoy their time on the island, they pack up to return home three weeks earlier than scheduled.
Having had a change of heart, Lina rushes over to Michael and Cathy's villa, only to discover they have already left. She rides a motorcycle to the airport and intercepts them just as they are about to board the plane. Overjoyed at seeing Lina again, Michael and Cathy return to spend the last three weeks of their vacation with her.