 The gang is in Wisconsin near Lake Michigan visiting Fred s Uncle Karl. What they don t count on is being terrorized by The Creepy Creeper of the Demon Lighthouse. Uncle Karl tells them of the legend of the Dauntless...a ship that was sunk with a priceless treasure aboard. The ghost of the Lighthouse Keeper has returned and is looking for the treasure. Joining the gang in solving this mystery is Verona Dempsey, a girl as brilliant at solving mysteries as Velma.