In 1894, fifteen-year-old Francie determines to fight the lumbermen and protect the largest Sequoia tree ever seen, which had been given to her sister just before her death six years earlier.
Thirteen-year-old Ben Ward drops out of school and joins his father working as a cook at the Blackwater Logging Camp in Minnesota in the winter of 1898.
Angry and lonely after her mother dies, eleven-year-old Hattie pretends to be a boy and joins her father on an adventure-filled rafting trip down the Delaware River in the late 1800s to transport logs from New York to Philadelphia.
After being turned out by his mean-spirited uncle, Chris Dahlberg decides to harvest some of the timber on his grandfather's land in Minnesota and float the giant logs down the Mississippi River to market in St. Louis.
When John has an accident while cutting logs in the Vermont woods, Tom, the Morgan horse who is his work partner and friend, uses intelligence and strength to rescue him.