Well, to determine if the book is fiction or nonfiction, you need to look at elements like the plot and the nature of the story. If it's imaginative and not based on real life, it's likely fiction. If it's based on actual events, people, or facts, then it's nonfiction.
I'm not sure which specific 'wonder book' you are referring to. There could be many books with 'wonder' in the title. If it's 'Wonder' by R.J. Palacio, it's a work of fiction. It tells a heartwarming story about a boy with facial differences.
It is fiction. In 'Wonder', we follow the life of a boy with a facial deformity. This boy, his family, his friends, and the events that unfold around them are products of the author's creativity. It's not reporting on actual facts or real - world occurrences as nonfiction would do. Instead, it takes us into a fictional world that is both relatable and engaging, making us care about the characters and their stories.
It is fiction. The story is a work of the author's imagination, set in Nazi Germany, and it tells a very moving and poignant story about a girl and her experiences during that dark time, but it is not based on a true story in a literal sense.