In this thrilling final installment in the Rivertown Adventurers series, intrepid teenage time travelers Oliver, Annie, and Ryan find themselves joining a band of nineteenth-century American pioneers heading from Missouri west across the Great Plains to Oregon and then to the gold fields of California. Filled with danger from gun-wielding marauders and brutal weather, the treacherous journey tests the trio's resolve, skills, and friendship. But the journey also reveals how they have grown into young adults, ready to tackle the challenges they will face for the rest of their lives.