Serpent & Dove (Serpent & Dove #1) by Shelby Mahurin

Synopsis: After two years of living as a criminal, Louise is suddenly forced to marry Reid, a Chasseur. The only problem is that the Chassuer are a group of elite witch hunters and Louise is a witch. She must decide if the marriage is worth it, since she might only safe from those who seek her while under the Chasseur's protection.