In Naples, Don Gaetano's company has Alvaro Ramirez as a partner, who is secretly in love with his secretary Laura.

The secretary is desperate, but Alvaro has another idea and puts a bomb on the safe, after taking more money and checks, simulating a robbery.

Alvaro tries to frame him, sending him with Carluccio to pick up a load carrying coffee, but in truth he also has contraband cigarettes inside.

Meanwhile, Laura goes to the home of Franco's mother, who, being blind, does not see her putting the stolen money between the pages of one of her books.

Don Gaetano returns and his daughter, in tears, tells him everything; but her father doesn't take it well and threatens to kill Franco.

At a celebration where the inmates are also present, Franco sings the song "Lettera Napoletana" on the radio, moving his mother and Anna who listen to him from their homes.