John Ripley (Glenn Ford) is the FBI agent called in to investigate a bank robbery that appears to be an inside job. Kelly (Lee Remick) is the terrified bank clerk who confides in Ripley when the sadistic mastermind of the crime threatens to kill her and her sister if she doesn't steal $100,000. Ripley's efforts are hampered by the fact that criminal Red Lunch (Ross Martin) is a master of disguise. In the gripping climax, Red is chased to Candlestick Park, where he blends into a capacity crowd watching the Giants fight for the National League pennant.