Il passante non passerà - S7.E17

A boy is beaten bloody by some thugs who disappear into the night. A friend promptly helps him but the two have placed a bomb in a construction site to prevent its construction. A full-scale investigation begins and Pettenella discovers that the engineer in charge of the project hides a not-so-sharp past. In a supermarket parking lot Giulia witnesses an accident involving two elderly people, the perpetrators of an alleged deception.