Trust Me on This by Jennifer Cruise

A great case a mistaken identities starts this book off to a great start.

Dennie Banks is an investigative reporter chasing down the biggest story of her career. Alec Prentice is a government agent working undercover to catch an elusive grifter. When they meet by accident, it's a case of mistaken identities at first sight. What they don't mistake is the instant attraction they have for each other, an attraction they'll do everything in their power to resist--because Dennie thinks that Alec is running interference for her interview subject, and Alec suspects that Dennie is linked to his swindler. As the confusion grows, so do their feelings for each other, and what begins as a romantic comedy of errors may just end in the love affair of a lifetime.