During a romantic picnic on Dibella's Island on Amston Lake, Dirk and Margot notice lights moving under the water. While investigating, Dirk finds a rare Dutch gold coin on the Sunken Island. How did a 300-year-old coin end up in Amston Lake? Having the coin puts Dirk’s life in danger. With help from a woman he knew years ago, they learn who wants to kill Dirk and where more coins can be found.
