Mutiny in the Big House (1939)

A young man forges a check in order to help his mother, but is caught and sentenced to 14 years in prison. The prison chaplain, seeing that the new arrival is a good man who's had some bad luck, sets out to help keep him out of trouble so he can serve his sentence and get out. However, his cellmate, a hardened con, sees the chaplain's interest in the young convict as something he can use in his planned jailbreak.