Darkest Mercy by Melissa Marr

Send the messengers for the Faery Courts. This is the end.

The Summer King is missing; the Dark Court is bleeding; and a stranger walks the streets of Huntsdale, his presence signifying the deaths of powerful fey.

Aislinn tends to the Summer Court, searching for her absent king and yearning for Seth. Torn between his new queen and his old love, Keenan works from afar to strengthen his court against the coming war. Donia longs for fiery passion even as she coolly readies the Winter Court for battle. And Seth, sworn brother of the Dark King and heir to the High Queen, is about to make a mistake that could cost his life.

Love, despair, and betrayal ignite the Faery Courts, and in the final conflict, some will win...and some will lose everything.


The thrilling conclusion to Melissa Marr's New York Times bestselling Wicked Lovely series will leave readers breathless.
 
- Goodreads Summary