Ghosts of Honolulu: A Japanese Spy, A Japanese American Spy Hunter, and the Untold Story of Pearl Harbor

What do the backgrounds of these authors offer to this particular story that historians could not? Does their background bias the conclusions drawn from the primary source documents? 

Why might this book have been unsuccessful if it had been published immediately after the Pearl Harbor attack?

The novel blends historical fact with dramatization to create an end product that infers many dialogues, thoughts, and minor actions in the lives of historical figures. In what ways does this aid the understanding of the events, and in what ways does this blend fiction and fact?