Geoffroy Delorme does not fit in the human world. As a boy, he dreams of transforming into a fox so he can escape into the forest. As he gets older, he disappears into the woods at night, drawn to the rhythms of animal life. One night, an encounter with a deer changes his life: from then on, he knows he wants to live among them.

Delorme becomes a creature of the forest. He learns to live without a tent or sleeping bag and forage for whatever food he can find. He blends in with the deer and, slowly, they accept him into their world. He witnesses their births and deaths, courtship and battles, ostracism and friendship over the cycles of their lives. Among the deer, he experiences the beauty, pain, fear, and joy of a life lived as a part of nature, not separate from it.

In his final year in the forest, Delorme meets a woman walking through the trees. He knows he can stay in the forest and die with his friends--or he can leave, and speak their truth to a human world that desperately needs to hear it.