The Mapmakers' RaceThe Mapmakers' Race follows Sal, Joe, Francie, and Humphrey as they misplace their famous mapmaker mother at the start of the Great Race. They must map a rail route through an uncharted wilderness. Having already lost their father on his last expedition, and with their finances depleted, this race becomes their last opportunity. The children have twenty eight days to find and map the best route. Along the way, they'll encounter challenges such as