Germain Cazeneuve left the police to work as a prison trainer, teaching inmates how to live once out of jail and how to stay out.

He stands guarantor when Gino Strabliggi, a printer by trade, is paroled two years before his twelve-year sentence for bank robbery expires.

Gino gets a steady job as a printer and meets Lucy, a bank employee, who moves into his flat.

On a regular visit to the police station to renew his parole, he is seen by Inspector Goitreau who originally arrested him and immediately follows him.

Thwarted, Goitreau starts harassing Gino, questioning his boss at the printers and his girl friend at the bank.