What is the author's perspective in the nonfiction book, One Thousand Paper Cranes: The Story of Sadako and the Children’s Peace Statue?

One Thousand Paper Cranes by Takayuki Ishii is the story of Sadako Sasaki a Japanese girl who at two years of age was exposed to radiation when the atomic bomb was dropped on Hiroshima. Ten years later at twelve years of age she was diagnosed with incurable leukemia caused by radiation exposure. The story is written in the third person.