Cavanaugh In The Rough by Marie Ferrarella

A crime–scene investigator and a gorgeous cop must track down a serial killer in USA TODAY bestselling author Marie Ferrarella's explosive new novel! 

For Susannah Quinn, heartbreakingly handsome detective Christian Cavanaugh O'Bannon is trouble that she doesn't need. Still, her CSI instincts tell her a serial killer's on the loose, so she agrees to work this case with Chris through long days–and even hotter nights. But his reckless charm is allowing him perilously close to her darkest secrets. 

Going by the book has never been freewheeling Chris's style, so an unofficial partnership with Susannah is just what he needs to stop a vicious murderer in his tracks. While he struggles to win the beautiful blonde's trust, mutual desire puts them both in harm's way…