When a group of terrorists hijack a train, the various passengers relive their memories.

Milan, one winter in the early sixties. Valeria, a free young woman who usually goes from one man to another, falls in love with Giampiero. This time, this is a serious relationship to the point that she contemplates marriage. All the more since she gets pregnant.

A casual monitoring becomes an obsession when a young man finds a man who reminds him of something that happened in his childhood.