Back in Black by Julie Ann Walker

A secret identity mixed in with forced proximity on top of red-hot chemistry? What could go wrong?

The Black Knights are back and better than ever!

FBI agent Grace Beacham is on the run. After an operation to bring down a Russian disinformation campaign goes sideways and ends in her partner’s death, the Kremlin has sent its most notorious assassin to kill her. Not knowing who to trust inside the Bureau, Grace is forced to call on the one man who might be able to save her. The one man she hasn’t been able to forget.
BKI operative Hunter Jackson walked away from Grace Beacham three years ago. And he hasn’t looked back. But when his cell phone suddenly jangles to life with Grace on the other end begging for his help, he doesn’t hesitate to ride to her rescue.

Grace is no stranger to men like Hunter. Men who are devastatingly attractive and in love with their perilous professions and no-strings-attached lifestyles. As the two of them go off-grid to uncover the truth behind what happened on her last assignment, she fears her life might not be the only thing on the line. With Hunter, her heart could be in danger too.