 Holdup man "Stash" Irwin robs the Apex Industrial Plastics Company of a $28,000 payroll, but is critically wounded while attempting to flee. He abandons his car, hides the money in a culvert, and hitches a ride with Warren Siddons (an Apex employee who is driving a nearly identical vehicle). After Irwin dies, Siddons is arrested at a Highway Patrol roadblock and appears to be complicit in the robbery, especially after Irwin s accomplices plant additional "evidence" in Siddons  home and office. Siddons steadfastly maintains his innocence in the face of seemingly overwhelming evidence to the contrary, and Dan Mathews and Officer Johnson eventually deduce that Siddons is either an innocent man or a fool. Betting on the former, they set a trap for Irwin s two accomplices.