Overview: While Anna and Luca investigate the case of a girl killed in the night by a hit-and-run driver, Roberto receives confirmation from Boni that Mauro's gun was recently fired. The policeman is tormented by doubt: what if his best friend was really guilty? Meanwhile, social worker Marina Stopponi decides that little Pietro must return to the institution. Mauro tries to oppose but the child is angry with him because he lied to him about Germana. Boni tells Roberto that the bullets found on Liverani's body are compatible with those of Mauro's gun: the officer hands the weapon to Giulia who immediately gives it to Captain Rea, for whom there are no longer any doubts about the guilt of officer Belli.