Smokies Special Agent by Lena Diaz

She was on a mission to fix the past, and he was determined to help her...

For ten years, Remi Jordan has been hunting her twin sister's kidnapper. When baiting a killer backfires, the FBI agent's career and freedom are suddenly on the line. Joining forces with Smoky Mountains investigator Duncan McKenzie ups the ante, unleashing treacherous desire. Now, with another woman missing, Remi's fighting a lot more than the ghosts of the past. Is she also ready to fight for her future?