Convicted: A Bureau Story. The Bureau, #5

Vietnam veteran Kurt Powell's addiction almost cost him everything, but a job as federal agent with the Bureau of Trans-Species Affairs helped him find sobriety and purpose. Now he tracks down dangerous paranormal creatures as well as humans who abuse their magical powers in illegal ways. Sent from Belfast to the United States as a boy, Desmond Hughes later fell into a disastrous relationship that led to horrific murders.
He's spent seventeen years in a bleak prison with few comforts and no hope of release. A new mission throws Kurt and Des together in a desperate attempt to prevent disaster. Sometimes what's long been lost can still be found, but the road to redemption is never easy-and a mutual attraction may not ease the way.