Knight by L. Ann

What if the woman who barges into your life is the one threat you can’t eliminate?
Evangeline Porter thought she was meeting the contact who offered to help her. Instead, she finds herself trapped with a man who’s equal parts paranoia and precision, holding her at gunpoint and questioning her every move. He’s not what she signed up for, and definitely not someone she can trust. But finding her brother means relying on a man who clearly wants nothing to do with her.
Knight Chambers likes his world neat, secure, and free of unnecessary complications. So when a stranger breaks into his apartment with stolen access codes and a story about a missing brother, he does what anyone in his line of work would do—chains her to a radiator and demands answers. He’s not the ally she was supposed to meet. He’s not even supposed to be involved. But now that she’s unleashed a virus in his systems, walking away isn’t an option.
With threats closing in, and the virus spreading, their only hope lies in working together. He needs her out of his system. She needs the truth.
But the deeper they dig, the more tangled the web becomes—and escaping it might cost more than either of them is willing to pay.