After a raging night at a disco, Marco and his mates return to his car where they find the body of Marco's murdered father in the boot. Inspector Rivera and his team are called in for the usual investigation, but while Marco is the prime suspect, somehow things don't quite add up.

In downtown Rome, three men are shot dead at the same time in three different spots. It's immediately clear that this is the work of a first-class marksman. But while two of the victims have no ID, the third one turns out to be a Colombian student. Something doesn't add up. Inspector Rivera and Rex are called in to investigate.