The Emperor of Any Place Emperor of Any Place by Tim Wynne-Jones

When Evan’s father dies suddenly, Evan finds a hand-bound yellow book on his desk—a book his dad had been reading when he passed away. The book is the diary of a Japanese soldier stranded on a small Pacific island in WWII. Why was his father reading it? What is in this account that Evan’s grandfather, whom Evan has never met before, fears so much that he will do anything to prevent its being seen? And what could this possibly mean for Evan? - from the publisher