I was wavering between three and four stars for this book, so I think it's more of a 3.5. I actually started this book awhile ago but didn't get into it and forgot about it, then recently picked it up again, and I'm glad I did. Grimspace follows Sirantha Jax, a disgraced jumper who possesses a gene that allows her to jump through space and enable pilots to navigate and explore space. We meet Jax in a sort of prison, where she has been held due to a mysterious accident that killed her pilot and an entire ship including political leaders, and she is taking the blame for their death. Pretty quickly, she's rescued (sort of) by a stranger and his rag-tag crew of the Folly. The book explores who this brooding rescuer, March, is, and why he and his crew rescued Jax in the first place. 
 I enjoyed the side characters of the story, and learning more about the backgrounds of the different crew members. We spend the story inside of Sirantha's head, and I liked that she could admit when she was wrong, and was definitely a snarky, imperfect heroine, but realized that she could change for the better. I think the only thing that made this just a good read instead of an amazing read for me was that I thought sometimes the action was a bit much and the plot felt a little forced at times, but the writing was really good so I could kind of overlook that. I'll probably keep reading to see how the series moves along, and how Sirantha and the rest of the crew continues to grow. Overall, I really like Ann Aguirre's writing, and will definitely be reading more from her!