Henry David Thoreau's early life unfolds as a changing nation struggles to live up to its ideals, while industry threatens the landscape. After attending Harvard College, he was inspired by Ralph Waldo Emerson to become a writer. Then, a family tragedy deepens his bond with nature, and, disillusioned with society, he builds a cabin in the woods to live simply, deliberately, quietly — and write.

After completing his two-year experiment at Walden Pond, Thoreau returns to society to test what he has learned about living responsibly. He undertakes new "experiments" as a surveyor, scientist, and abolitionist, and takes two more trips to Maine — uncovering even deeper truths about life and the world. He writes with a new urgency as a lifelong illness begins to catch up with him.