In the city of Ostuni in Puglia, the mute seminarian Ercole is designated to be the driver and nurse of Parsifal, the paraplegic son in a rich and sanctimonious family of landowners. Ercole soon becomes the lover of his master's wife, the beautiful Baroness Clotilde. In a familial and social context where only money, sex and power count, everyone tries to take advantage of everyone, but the real saprophyte turns out to be Ercole.

Good bourgeois damage unintentionally life of a drug-party, during which the mistress of the house is raped without recognizing the aggressor. Both she and her husband come into crisis and try to figure out who it was. The truth comes to the surface slowly, and it is unexpected.

An acid portrait of Italian youth at the time, I DELFINI follows a dreary season of discontent and viciousness in the lives of a thoroughly unpleasant group of mostly rich youngsters in a small Adriatic coast city.