Fresh from a dangerous mission, Eli Sands and his friends Clyne and Thea are thrown into nineteenth-century America after an accident with their time-travel vessel. Clyne is stranded alone in hostile territory, while Thea and Eli pop into the beginning of the famed Lewis and Clark expedition. After Thea is mistaken for an escaped slave and taken into custody, Eli joins the expedition in the hopes of finding Clyne, rescuing Thea, and heading home. While trying to regroup and escape, Eli and his friends make alarming discoveries about their stumble into 1804. Will their time-travel accident change the course of history?