Ernie Cahn leads a holdup of an armored car near Detroit. Cahn and his confederates had first stolen explosives from a National Guard armory which they then used in the heist. But Cahn, brash and arrogant, traits that will prove his undoing. Erskine and Daniels lead the bureau's hunt for Cahn. But Cahn may not survive long enough to be apprehended by the FBI. Cahn's employers have concluded he's a liability and plan to have to him killed.