The Ballerinas earned a four-star rating from me. It falls under the mystery/thriller genre, although you wouldn't think so based on the cover. Through the pages, you follow the main protagonist, Delphine, and her obsession with ballet, even years after she has given up dancing to be a choreographer. The timeline of the book bounces back and forth from past to "present" until the two meet in the middle. By doing this Kapelke-Dale continues the fluidity of the story while also giving the reader background knowledge into Delphine's motives and actions. The Ballerinas captures friendship, the Paris Opera Ballet, and a hint of mystery that will leave you shocked. 
Throughout the story, I kept forgetting that it was a mystery. I think it takes an excellent writer to be able to suck you into a story so deep you forget what genre you're reading. Or a terrible one I guess. In this case, I think it was great! I was so wrapped up in the story that the mystery elements came as shocking twists and turns that left my mouth hanging open. As mentioned above, I gave this book a four-star rating. The main thing that kept this from being a five-star read for me was that the beginning was slow and some parts throughout. I also did not hear much about this book after its release, even after I was granted a copy from Netgalley. It took me a couple years to decide to pick it up, and when I did, I was NOT disappointed!
I would recommend this book to those who enjoy twisty-turny mysteries and rekindled friendships. I would also recommend to those who love the ballet, more particularly the Paris Opera Ballet. That being said, The Ballerinas is set in Paris and Russia which means there are a lot of French and Russian words to pronounce.