Rules of Attraction — Susan Crosby

Hired to keep Claire Winston's sister under surveillance, Quinn Gerard was stunned to find he was following the wrong woman when he and Claire came face-to-face...body to body. Knowing Claire would eventually lead him to his quarry, the daring P.I. vowed to keep her close, but in doing so he risked more than he could have imagined. For Claire's loving nature -- and passionate secrets -- had shaken the unshakable Quinn to the point where once his job ended, he didn't know if he would ever be able to walk away.

That was the thing about rules.... They were made to be broken.