One of a slew of prison reform picture that flourished during the Great Depression, this melodrama was banned in Finland. Pat O'Brien stars as Steve Jameson, a former Army officer who is hired at the infamous California prison of the title and quickly brings military order to the facility, separating the general population from the most violent offenders. In the meantime, Steve is falling for a singer, May (Ann Sheridan), but he keeps his profession a secret when she reveals that her brother Joe (Humphrey Bogart) is serving time in San Quentin. May eventually learns of Steve's deception and their romance hits the skids. When a jealous rival guard, Lt. Druggin (Barton MacLane), arranges for Joe to discover the romance between Steve and his sister, Joe begins plotting escape and revenge.