Despite the dangers, Black Cloud enjoys his life as a wild mustang colt in 1951 Nevada but when humans round up and slaughter his herd, he is rescued by a talkative girl named Annie who gives him a safe and comfortable life, lacking nothing but freedom.

Late in 1848, nine-year-old Joshua McCullough starts a second journal, this time recording events in Willamette Valley, Oregon Territory, as his family and others they met on the trail begin to get settled.