Why did he become so famous that mountains, parks, trails, schools, a glacier, a millipede, and even a planet are named after him? This is the story of John Muir's adventurous life, from Scotland to his legendary exploits in America, where he became an inventor, a global explorer, and the first modern environmentalist-- and even made friends with a president! His heart was always captivated by the outdoors and he aimed to experience all he could....

After finding that New Mungo is not the refuge they sought, Mara, leaving Fox behind, again sets out to sea with a ship full of refugees and, with the help of the "Gypsea" boy Tuck, tries to find land at the top of the world that will be safe from storms and rising water.