Nick Darcy thought he'd left his past behind…until McKenna Rigsby showed up wounded on his doorstep.

Nick Darcy has always needed rules. So when he's temporarily suspended from a job he's dedicated his life to, the unstructured days ahead make him desperate for a distraction. That's when a blast from the past resurfaces on his front steps, bleeding and spinning a wild tale of assassins on her trail.

Their history is complicated. But Nick is still McKenna Rigsby's best chance when it comes to surviving.

Her cover blown by a mole in the FBI, she needs a partner who can stay levelheaded in a firefight. She has no doubt they're headed for a showdown. And that this time, there won't be any rules left to break…