Crime thriller starring Taylor as the skipper of a small boat that runs off the coast of England. He is hired out by a strange foreigner, Heinz, who pays him a large sum of money to be transported to Holland. En route to Holland, the man dies and Taylor discovers an interesting map on his body. When Taylor and his boat get to Holland, a woman claiming to be Heinz's daughter, Christian, is caught searching the cabin. She escapes, and soon after Taylor learns that his passenger was in reality an investigator on the trail of valuables stolen by the Nazis and stashed in Holland. Determined to get to the bottom of the mystery, Taylor enlists the aid of Heinz's real daughter, Maurey, and they set sail for the destination on the map. Eventually they find the treasure, a cache of diamonds, but the Nazis, who followed the foolish pair to the loot, have them cornered. Thank goodness the Dutch police arrive and save the day.