Covert Agent's Virgin Affair by Linda Conrad

Undercover agent Jake Pierson figures one romantic dinner will get never-been-kissed librarian Mary Walsh to tell him everything she knows about her late father’s criminal activities. But the more Mary talks, the more Jake wants to shut her up with kisses. Because he’s falling for his own too-trusting target — and there isn’t a damn thing he can do about it. Well, maybe one thing...

With her shiny new lease on life, Mary has become wiser about a lot of things. For one, she can spot a liar a mile away. She knows her gorgeous new boyfriend is hiding something. And she has a sneaking suspicion those secrets will get them both killed unless he trusts her with the truth.