Mauro and Roberto investigate the beating of sixteen-year-old Bruno Cordari, which took place in front of his high school: the boy is in intensive care. The two officers of the X Tuscolano will discover a fierce baby gang that terrorizes the institute by stealing the scooters of the students who are then beaten to force them not to file a complaint. The vehicles are then received by the young janitor and Bruno, the aspiring leader of the gang, who in competition with Andrea Moretti, a classmate of his who becomes the main suspect. But the story is even more complex. Meanwhile, Germana has been summoned by Terenzi for an interview: the former para' feels in danger and wants to tell her everything he knows.