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I always enjoy historical fiction, the intertwining of the non-fictional bits of history is always a pull for me, the fictional portion being just enough "drama" to keep me interested. However this book was written, chapter for chapter, going between Marie Curie's real life in Paris and her "what if" life in Poland. While both stories kept me engaged, I had a hard time going back and forth every single chapter. I almost wished the book were written in two halves instead. It wasn't a 5 star read for me but a definite 3.75-4.0, especially if you also enjoy historical fiction.