The Outdoor Girls at Rainbow Lake; or, The Stirring Cruise of the Motor Boat Gem

Grace Ford is thrown from her brother's horse, Prince, as she returns home with some important papers. The horse—and the papers—disappear! Even worse, Mollie's sister, Dodo, is trampled by the horse and may be permanently crippled. Mollie's family agonizes over Dodo while Grace's family worries about the lost papers...