The Unkindest Tide

 The Unkindest Tide by Seanan McGuire, 368 pages.

This is the thirteenth book in the October Daye series and it's selkie time. When the selkies were first created it was with the understanding that the Luidaeg would one day destroy them, and it's finally time for the debt to come due. Toby's debt is called as well, as her magic is necessary to turn all of the selkies into roane, the race that was slaughtered and whose skins the selkies wear to give them their magic. And if that whole situation isn't complicated enough, the big event is being held in the Duchy of Ships, where Toby gets pulled into unrelated politics of the undersea for the sake of old friends.

I think this is one of the weaker books in the series, although I still definitely liked it. The plot felt less tight than usual though, and I didn't feel like the threads quite came together. That being said, the Duchy of Ships is an awesome setting, and I love how much time we got to spend with the Luidaeg and the selkies.