From the Californian desert to the rainforests of Alaska, naturalist and writer Louis-Marie Blanchard sets out on a 5,000-kilometre journey in the footsteps of ecological pioneer John Muir. Through the emblematic landscapes that Muir helped to save, he sets out to meet the men and women who keep alive his fight to preserve the wilderness. A journey of initiation, poetry and commitment, driven by a deep and intimate admiration for the man who changed his life.