The back of the book has only quotes from reviews. Wikipedia describes the book this way:
Eva Luna takes us into the life of the eponymous protagonist, an orphan who grows up in an unidentified country in South America. While the country's political history, traced through several decades of the mid-20th century, bears many similarities to Chile (the author's original nationality), the geography and social context of the story depict a society more similar to Venezuela.
The novel takes us through Eva Luna's journey though life so far and her ability to tell stories, interweaving Eva's personal story with the broader geopolitical turmoil of Latin America during the 1950s - 1980s.