Boston Blackie is a former prison inmate campaigning to outlaw Warden Benton's infamous "Water Cross" torture. Benton, however, is successful in his attempt to have Blackie arrested and returned to the prison, but his evil schemes are ultimately thwarted by Mary Carter, Blackie's girlfriend, who manages to alert the governor.
William Russell
as Boston Blackie
Eva Novak
as Mary Carter
Frank Brownlee
as Prison Warden Benton
Otto Matieson
as Danny Carter
W.C. Robinson
as Shorty McNutt
Fred Esmelton
as John Gilmore
