Out on the suburbs of Rome, Anna meets up with her friend, Claudia. They, along with Anna’s boyfriend, Sandro, and a few other wealthy couples, are about to set off on a weekend yachting trip to the Aeolian Islands north of Sicily. As the ladies drive to pick up Sandro we learn that things are not all well between the two lovers. At Sandro’s apartment, Claudia waits outside while Anna and Sandro have some awkward sex. The three then speed off to their destination.
The next day, the group has set sail around the islands. While the cruise should be pleasurable, it’s not for Anna who seems tortured with her thoughts. She jumps into the Mediterranean for a quick swim, and some others follow her lead, including Sandro. Anna quickly starts yelling that there is a shark in the water, causing a huge commotion, and everyone heads back to the boat, but the whole story is a lie. Anna made it up to get Sandro’s attention.
The group then docks, and goes ashore on one of the small islands where Anna confesses to Sandro that she’s tired of him running off on his long business trips. Sandro decides to ignore her, and take a nap on the rocks. He is woken up when the group wants to leave the island due to the weather turning bad, but Anna has disappeared. We learn this is not her first time doing something like this. It is actually quite typical of her. A boat is heard nearby as the group sets out across the tiny island to look for Anna, but she is nowhere to be found. Sandro, his friend, Corrado, and Claudia stay overnight while the rest sail off to get the authorities.
At sunrise the next day, Sandro, in many ways, seems over Anna as he begins to hit on Claudia. She, in return, rebuffs his advances, but not entirely. The police arrive with Anna’s father, and announce they have arrested a group of smugglers who are being held in Milazzo, a small town in northeast Sicily near Messina. Sandro gives Claudia a firm kiss goodbye as he heads out to that village. Claudia rushes off to look for Anna on one of the other nearby islands. Afterwards, everyone is to meet back at Corrado’s villa in Palermo…