My absolute favorite kind of historical romance is one about an estranged married couple (Eloisa James is the queen of this trope), and I’ve been hoping Sarah MacLean would decide to write a story for Seraphina & Haven since the moment I first encountered them in the first book in this series. And this was so good! They had a lot of issues to overcome, but they managed it in a satisfying manner (with plenty of groveling from Haven, which is as it should be). MacLean struck a nice balance between emotion and humor, and this gets bonus points for featuring, of all things, an underwater ballroom. Which is not relevant as far as anyone’s enjoyment of this book goes, but it’s just cool. I like cool stuff!