Tommaso, a quiet, thoughtful child of five, lives in a world of his own, conversing daily with three imaginary friends. Seemingly loved by his parents, Tommaso senses that their affections are superficial and he yearns for something more.

Michael is the younger son of a middle-class family, a strong-willed and free-thinking fellow, who is off in some distant country fighting for a revolutionary cause. Everyone in the family writes to him, describing the events of their lives, as they drift into a kind of conventionality which would perhaps have horrified them earlier. Only Michael’s girlfriend Mara, the mother of his child, retains her independence, even though it is through the help of Michael’s increasingly conventional friends and family that she survives.

Police detective Paolo Germi and the mysterious Marisa meet each other at a dance hall. Germi is unsuspecting of the secret Marisa is carrying with her: adverse conditions forced her into prostitution. As Germi finds the young girl brutally murdered, he decides to go after her killers. During his investigation, he enters a world of intrigue and obfuscation that leave an endless trail of blood.