Books in the Coven of Shadows and Secrets series

The Princes of Hell have begun their unforgiving conquest of Earth.The Vampire Royals have summoned me. And the remaining Vindix are yet to be found. Los Angeles has fallen to darkness and it's only a matter of time before other cities follow. Where will be next? No one knows, and no one is safe from the seven Princes of Hell and their followers.As for me, I have a job to do-find the rest of the Vindix. But first, I've been summoned. The vampire royals in Isila have demanded an audience with Tobias and me. So we journey to the realm of Isila, a world as perilous as our own and, wouldn't you know it, chaos that will change the course of my mission ensues.