A Chip In His Shoulder - Falling Sky, #1

"Contract killer" is a fitting job for a vampire, and it suits Liam just fine. Cast down from the wealth and status of the Sky for taking a human lover, Liam lurks in the poor and pollution-choked Gutter, killing to survive. Between his natural strengths and his Cybernetix mods, no mark has ever escaped him. Liam's ex-lover Daniel is the heir to Cybernetix-and its greatest threat. Horrified by people less man than machine and the exploitation of Gutter factory workers, he'd rather destroy Cybernetix than inherit it .