Tinto Brass, director of "Caligula" and "Salon Kitty" brings you "The Key", the story of married couple, Nino and Teresa Rolfe, who, three days into 1940, on the 20th anniversary of their wedding, begin to keep diaries expressing their most intimate and private thoughts on paper in the hope that somehow these thoughts will be communicated to each other.

"The Key" of the title opens the drawer where, unknown to each other, the husband and wife hide their diaries. Nino wants his wife, who is 18 years younger than him, to open up her soul sexually. To this end he sheds his inhibitions in his diary, writing down his most bizarre sexual fantasies. He then discovers that his wife and their daughter's fiance, Laslo, are attracted to each other. Nino tries to stimulate an affair by taking explicit photographs of Teresa and having Laslo develop them...