When a hot young prosecutor learns that a man he got convicted and executed was in fact innocent, he quits his DA job and becomes a defense attorney. He grows rich and powerful defending guilty racketeers, but eventually sees the errors of his ways.
A group of spies is after the plans for an anti-aircraft gun, and the leader uses the opportunity to embroil the Lone Wolf in the plot. Trying to settle an old score, this shady character implicates his old nemesis by forcing him to crack the safe where the plans are stored.
