The film stars Louis Hayward, Joanne Dru, Paul Kelly, Maureen O'Sullivan, George Macready and Horace McMahon.

He is the interim warden at San Quentin, given the job for 30 days after violence and corruption swept what was then the nation's largest prison facility (Kelly, who played Duffy, was actually an inmate in San Quentin in the 1920s).

Duffy aims to make his few days matter, cracking down on notorious guards, wiping out a stool-pigeon network and hiring the institute's first female nurse.

Based on his memoir, Duffy of San Quentin tells the story of the warden's pivotal early tenure through the prism of his interactions with volatile inmate Edward Harper.

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