The book is based on true events and written like a diary of the two years Julia Butterfly Hill spent squatting in an ancient redwood in order to protect it. The tree had been named Luna by activists.

Hill began treesitting in December 1997 and stopped when she made a deal with the Pacific Lumber Company. In a first person narrative, Hill relates how she appealed to the universal spirit and spoke to the tree. All profits went to the Circle of Life Foundation.