Storm of Flames by Alisha Klapheke

Tahlia, Marius, Fara, and the rest of the dragon-riding Mist Knights are off on another mission…
When the order flies north to fight the pirates harassing the coastline, they discover the infamous Eelsmen have a new high captain.
Not only is this individual unknown, he is an Unseelie—a powerful Seer from the Realm of Night.
And Tahlia’s weaver magic sees a dangerous connection between this enemy and her dearest friend, Fara.
What does this mean for the Healer? For the order?