A Real McCoy (The Magnificent McCoy Men #6)
Tori Carrington

Kat always figured she could handle just about anything...but a murder rap is a little daunting, even for her. And worse, she's now being smothered by people determined to protect her -- her father, her brothers and gorgeous U.S. Marshal Harry Kincaid. Not that she minds his attention. But she can think of better ways for Harry to make sure she doesn't get into trouble.
Once it's uncovered that Kat's fiance was in the witness protection program, it becomes obvious that there's only one way to nail the killers -- Kat has to act as bait. And despite everybody's protests, she willingly takes the job. After all, it's time they all learned that Kat is definitely... A Real McCoy.