What is the author's tone in the nonfiction book, Little Princes: One Man’s Promise to Bring Home the Lost Children of Nepal?

The author's tone is usually lighthearted. When showing his mistakes, or the craziness of the kids, it is done so with a knowing nod and a wink. These are the times when the book is very funny.

This tone changes as the emotions change in the story. When there are other emotions to feel, there is less humor. That is not to say the humor disappears altogether. When they are crossing the mountains, there is real dread, but he makes light of his own food poisoning and other problems. Occasionally, Grennan speaks to the reader as if he is speaking to a friend.