[1][2][3] The upper class couple Stefano and Giovanna spend the summer in their little house on Lake Como.

One morning a young couple pitched a tent on their property and is swimming naked in the lake.

He lets the couple spend the night in his house and makes hints that he would be interested in a partner swap.

While reading the box number ads in the newspaper, she suddenly discovered something that she suspected Stefano was behind.

When the second couple comes to visit, Stefano takes a liking to the woman, but Giovanna finds the man pushy.

An unexpected opportunity arises later when they let their friends Diego and Gabriella show them a large palazzo.