EXSANGUINATE by Darrell Shaffer

Jason Zaddok was raised in a monastery to hunt the supernatural, but a rebellious streak has brought him to his last chance. Despite all intentions to follow orders he can't ignore the screams of torture and breaks rank to save the life of Teenage boy and exiling himself in the process.

Jason is forced to find a new way of living in the city of Detroit, but there are still plenty of things that go bump in the night. Kaiden is trying to build the family he never had after being rescued by Jason. Then there's the mysterious vampire that can't seem to recall who he is, or how he arrived in Detroit.