Kingdom of Lies - Debra Dunbar - Bog

A gemstone might destroy the world before I get the chance to do it myself. Interdimensional rifts are opening, spilling supernatural creatures into the world of the humans. Locating and closing the gateways takes two-an angel and a demon. It's the opportunity I've been waiting for, the common goal that might allow demons and angels to put aside nearly three million years of hate. But there's a stolen gem I need to find to pay off a debt-a gem with a dark power that could shatter any hope of peace between heaven and hell. I'll have to decide where to focus my energies and choose who to trust, or a war will descend on us that rivals the one that originally split the angelic host.