Celestial Fire — Emma L. Adams

The stakes are higher than ever for Devi Lawson.Former celestial soldier Devi Lawson is now working for the warlocks, but the fragile peace between the celestials and the preternaturally gifted rests on a knife's edge. When a mysterious demonic virus sweeps across the city, turning vampires and celestials alike into bloodthirsty killers, it's up to Devi to work with the enigmatic and dangerous warlock Nikolas to discover the cause before the city is overrun. But with power forces shifting in the demonic realms and the shadows of old enemies pursuing them, it becomes clear that everyone is keeping secrets, none more so than Nikolas himself. To survive and protect those she cares about, Devi must embrace her terrifying new demonic powers, at the risk of losing her soul to the netherworld...