The Dog in the Dark (Noble Dead — Series 3, Bk. 2)

Magiere, Leesil, and elven dog Chap are continuing their quest to find the powerful Orb of Air. But they are not alone. Aging elven assassin Brot’an has forced his company on them while also offering his protection. Chap doesn’t believe his ruse, however.
 
As they sail, Magiere struggles with her own dark nature, using Leesil’s love as an anchor to keep her grounded. For the personal price she paid to procure the Orb of Fire was more than she thought—and more than she wants to reveal to anyone.
 
But that is exactly what the cunning Brot’an wants to know. And he is willing to do whatever it takes—even if he must reveal his own dreaded secrets, which may cost the entire party their lives…and their very souls.