Dopplebanger by Cindi Madsen

She’s on a road trip with the wrong twin brother.

My twin brother’s talked me into a lot of crazy things, but taking his place on a road trip with his girlfriend so he can party with his friends is a whole new level of insanity. What’s even more insane is I somehow find myself agreeing to it—thanks, alcohol, guilt, and bribery. I’m determined to undo the arrangement, but then I meet Gwen, this sexy redheaded hurricane of energy and brains. And then she kisses me.
Just like that, I’m driving her up the coast, on our way to a wedding with a mess of complications. With each hour and each stop, I’m falling harder and harder for a woman who doesn’t know my actual name. I’m trying to do the right thing. Or the lesser of the wrong things. All my life I’ve had to clean up my brother’s messes, but for the first time ever, I’ve landed the upper hand in one of our switcheroo schemes. Now I’ve just got to come clean and convince Gwen that I’m the brother she should be with.