I still can't believe I got an ARC of this and was able to read it early! The Lady Astronauts series is one of my all time favorite series and it means so much to me. The Calculating Stars is probably my most recommended book on my blog and in real life. It was a little weird to read at first because we are getting a new perspective. The Relentless Moon follows Nicole Wargin, one of the original female astronauts chose for the space program who is married to Kansas Senator Kenneth Wargin. Nicole's voice is extremely different from Elma's so it took me a while to get into it because I'm very attached to Elma's character. About a third of the way in I became completely immersed in the story and found myself rooting for her throughout the book. There were some intense parts of this book due to Nicole's history so it's not necessarily an easy read but it was neat to see how Nicole, Eugene, and Myrtle flourished in a situation that no one saw coming. I also want to mention that there are many discussions and disordered thoughts relating to eating disorders so if that is a massive trigger for you I don't recommend picking this up. It's extremely present and apparent throughout the novel so be aware of that going in, it handles things positively but there are some thoughts that could be triggering. I absolutely loved it and I can't believe that I got an ARC of it! (Now I have to wait even longer for the next book though!)