Sandby receives a towing contract so he hires Hooter's boat to pull the load. While unloading the barge they discover illegal drugs hidden inside the bales of hay and are held prisoner because of this knowledge. Robert and Daryl Sandby, K.R.'s nephew, telephone for help and then they are too captured. The police round up three of the crooks. Kate and Franz detain the ringleader, who is trying to escape in a float plane, with skillful flying.