Muscle bound psychopath Terry Bartell (William Smith) dumps weighted down Vangie (Suzy Kendall) in the river. He's unaware that Travis McGhee (Rod Taylor) and friend Meyer (Theodore Bickell) are doing a spot of night fishing from their boat under the bridge. Travis rescues Vangie and retrieves the weight. When Bartell locates Vangie and has his accomplice kill her in a hit and run, Travis decides to track Bartell down and exact revenge.