Illumination by Susannah Sandlin

He came to Penton seeking peace. Nik Dimitrou joined the Army to escape his family legacy, only to have his psychic abilities exploited as a weapon. Now, as a civilian, he turns to the bottle to veil the images that haunt his mind whenever he touches anyone—except vampires. With them, he has finally found a place. But as Penton moves into open warfare with the Vampire Tribunal, Nik finds himself a linchpin in the deepening conflict, not to mention a transformation in his own body more frightening than anything he’s faced.
She wanted to change the world. Shay Underwood watched her Peace Corps parents move from one third world country to another—until both died following an outbreak of fever. Driven to her own career in tropical medicine, Shay works to cure the disease that killed her parents—until a careless weekend outing draws her into a world far more dangerous than the diseases she studies: a vampire society engaged in human trafficking.
Two cities, two strangers, one world. With Penton rebellion leader Aidan Murphy making risky choices and chief vampire lieutenant Mirren Kincaid forced to take a leadership role for which he is unsuited, it will fall to two outsiders, Nik and Shay, to find a way for Penton—and themselves—to survive in this much-anticipated conclusion to the award-winning Penton Legacy series.