Marco Serra, a middle-aged judge, lives with his wife Laura and teenage daughter Mirella. The man is dealing with a case of sexual assault by a certain Mariani, a plumber, about Annetta Rossi, an underage girl.
Young Gigi is summering with uncle Amedeo and his wife Betsy attempting to learn English. His cousin Gemma, however, despite being betrothed before teases him and then she becomes his lover. Now Gigi manages to seduce Betsy for a night of passion.
Police believe that a respectable industrialist is actually the head of drug smuggling ring in Milan.
