about how the main character are interesting? and what is "big topics"?

Sophie is an interesting teenager who has an interesting life. She spends her vacations in the Congo with her mother. Sophie's mother founded and operates a sanctuary for bonobos, a type of ape with a DNA very similar to that of humans. Sophie doesn't adapt well to the move to Miami but she is also torn when she spends her summers with her mother. She is half black, half white, which also sometimes seems to weigh on her. The main idea of the book is the plight of Bonobos in Africa.