Except fictional stories about Wolrd War II.
Historians will base themselves on either secondary or primary sources but never a fictional one.
If you were to write a history book (a nonfiction) about how Hitler massacred the Jews, you wouldn't take a fiction from an author that wrote it in 2001, because it isn't real sources, but inspired from and the goal is a story, not teaching or transmitting informations.
Historians base themselves on facts, and what really happened, not on fictional stories.
Hope I could help
