Nobody’s Princess by Sarah Hegger

Where there’s smoke, there’s fire.
Tiffany Desjardins has a plan. The only obstacle in her way is her not-quite-ex-husband, Thomas Hunter, who she needs to find if she wants to marry the true man of her dreams. Unfortunately, four years is not long enough to forget Thomas—how he turned her life upside down and woke a rebel in her heart.
Whatever Thomas Hunter puts his formidable will to, he conquers. All except his brief and explosive marriage. As it turns out, the first step to putting his past behind him is joining Tiffany in a rare Lamborghini Miura.
Old flames rekindle, and past hurts surface as Thomas attempts to make peace with his failure, and Tiffany searches for what she truly wants.
On their wild-ride road trip, only one thing is sure—all paths lead them back together.