Invisible Kingdom #4

Plot

Suddenly, Vess is the Sundog's unlikely new crewmember, and Grix is at the forefront of an unexpected battle--but their earth-shattering discovery won't shake their faith or ferocity. They're unquestionably in this together . . . but who will help them? And how much time is left before Vess and the Sundog are captured . . . or worse?