See full review for Darkest Mercy at: https://toomanybooksnotenoughshelves.... 
 After three years, I finally finished this crazy series about faeries. Book 5, like books 1 and 3, covers our main characters - The Summer King and Queen. Keenan is missing, but he hasn't been taken by anyone. You learn fairly quickly that after what happened in book 3, he went off on his own to figure out what he wanted. Not just as a king, but as a faerie. Ash is handling the Summer Court well in his absence and only wishes that he will return because of what is going on with Niall and Bannach. War is threatening and she needs her King. Especially because Seth isn't really seeing her these days, not until she chooses, which man she'll be with. 
 Out of all five books in this series, I think this one was probably my favorite.