 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.