Knight's Salvation (Knights of Hell #2‪)‬

Demon hunter Zenon lives with a dark secret. When he escaped Hell, he didn't leave alone--and he'll do anything to keep the shameful reason hidden. But when an intoxicating demi-demon, new to her powers, has him breaking all his own rules just to be near her, he knows he's in serious trouble.

Painfully aware of being different, Mia Westbrook has always kept herself apart from others. Yet her new demon life comes with strings attached, namely one scarred and broodingly seductive knight who storms into her world--and her heart--and may just be her perfect match.

But a formidable evil has been watching, and is determined to tear them apart. They want Zenon is back in Hell, with them, where he belongs...