An undocumented body is found on the banks of the Tiber. She is a homeless woman, mother of a little girl of whom she retains every memory and who she probably disowned immediately after giving birth. Who could want her dead?

The clothes found in a school courtyard, accompanied by a writing that does not bode well, belong to a missing boy. Listening to the students we discover that he was a victim of bullying, but no one in class wants to say anything more, until the discovery of his death.

A serial hoarder is killed in his apartment. To solve the case, the contribution of the psychologist who had been following the man's disorder for some time was fundamental. Between her, Monica Porta, and Malik there is an immediate feeling, not just at work. The continuation of the investigations definitively exonerates Muzo by demonstrating that Olga and Paolo were killed by the same person.