 The wealthy Anna is not sure about her feelings with her lover Sandro. While in a yacht trip with her upper class friends including her best friend Claudia in the Sicily coast, the group decides to visit a desert volcanic island. When the weather changes and they have to leave the island, they note that Anna has vanished. Claudia, Sandro and another friend stay in the island during the night trying to find Anna, while the rest of the group returns. On the next morning, they bring the coast guard and Anna is not found. Along the next days, Sandro and Claudia search Anna in the most different places in Italy and develop an attraction for each other, becoming lovers.