I received a free ARC copy of this book from NetGalley in exchange for an honest review 
 I absolutely loved this book. Really the only reason I gave it 4 stars instead of 5 is because I feel like it had some pacing issues. Don't get me wrong, it was great and I finished it in two days, but at one point I realized I was about 2/3rds of the way through the book and I didn't really feel like a lot had happened plot-wise, then the last few chapters felt a bit rushed, like she ran out of time and was just trying to tie up all the loose ends. 
 But it was still a really great book, and I absolutely love Cas and Swift's relationship. (view spoiler)[I just feel like it's a very complex relationship that you don't often see in YA, or really in any literature. I again want to say how happy I am that the first book dealt with them not being on equal footing and how Cas couldn't really consent to anything when she was still a prisoner. And I liked their development in this book too. It's clear they both really care about each other and they've got the other's back when it really matters, but they have problems and they fight sometimes and it all just felt very real. I'm glad they got their happy ending too! (hide spoiler)] 
 And like I said before, the plot seemed a bit unbalanced in this book. (view spoiler)[It's like she tried to up the stakes by having a whole herd of rogue reckoners but it doesn't even really become an issue until like 3/4ths of the way through the book. I mean they don't even decide to go get Bao again until past the halfway point. I would have probably liked a bit more monster fighting throughout, as it all felt pretty squished in there at the end. But I did like the ending and I'm glad everyone got their closure. I've seen some people say that Cas abandoned her family but I don't think that's really true. I mean she's going to visit them still and her dad doesn't even want to see her at all at this point so why would she want to move back home. Plus she has a job to do right now! (hide spoiler)] 
 But really overall this was just such a great series. I feel so blessed that 'lesbian pirates fight / train giant sea monsters' is a book that exists during my lifetime. Definitely recommend!