A motor boat named Gem. A summer lake. And a mystery that won't stay buried. When Betty Nelson's sea captain uncle arrives with promises of adventure aboard the Gem, the Outdoor Girls expect nothing more than sunshine, camaraderie, and the open water of Rainbow Lake. But the cruise takes a dangerous turn when Grace's horse bolts, scattering important papers across the countryside and leaving young Dodo injured in its wake. As if that weren't enough, rumors of ghosts on Elm Island begin to circulate, adding an extra layer of intrigue to their journey. What begins as a carefree summer adventure becomes a test of courage, loyalty, and quick thinking among friends. This 1913 juvenile adventure delivers genuine stakes and early 20th-century charm for readers who want wholesome excitement with real consequences.
