So Wrong It’s Right by Julie Johnson

Shelby Hunt has the perfect life, married to the perfect man.
At least, that’s what anyone would think, looking at her. They couldn’t possibly know about the past five years of lonely nights, or the divorce papers still sitting unsigned on her husband’s desk, or the shady business practices he’s brought home on more than one occasion — often in the form of scary men with loaded guns and briefcases full of laundered cash. The truth is, Shelby’s perfect life is starting to feel like a prison… one she’s not sure she’ll escape from alive…

Special Agent Conor Gallagher has no time for romance.
As the head of Boston’s elite Organized Crime division, the seasoned FBI agent is far more interested in tracking down bad guys than wining-and-dining dates. But when a new case steers him directly into Shelby’s path, he can’t help the fierce protective instincts that rise up inside him. She needs an ally. A protector. Someone to keep her safe until the fallout from her husband’s criminal activities is contained. But as Conor gets closer to the plucky brunette, that protectiveness starts to feel a whole lot like passion… and the more time he spends with her, the harder it is to imagine ever letting her go…