The spotlight is on Viola, an icy girl serving a sentence for murder with the aggravating circumstance of cruelty. The girl is charismatic and Ciro himself suffers from her magnetic charm. Naditza comes into conflict with her and tries to free other inmates from her "yoke". Matron Paola has a new project for the WM: to have the boys participate in recreational activities together with the girls. Commander Massimo is against it while Beppe proposes a music course: Naditza can play but has never studied, Cardiotrap can sing but doesn't know music, Filippo could be a teacher. The first lesson does not go as hoped. To appease Pino's aggression towards him, Filippo does the last thing he should do: he buys him a present. Pino thanks him, but soon the others demand the same treatment and when their requests are not met, trouble begins.
