What is the author's tone in The Man Who Listens to Horses by Monty Roberts?

The tone in the Man Who Listens to Horses is primarily objective when it comes to events in Monty's life. Monty is a reliable narrator and recalls the important events in his life that make him the man that he is today. He is careful to accurately describe historical events that influence the course of his life. For example, he is impacted by various events including the depression, the War and Japanese internment camps in California. He also describes other factual events including the making of movies that he is involved in and events of cultural significance, like the death of James Dean.