Make-Believe Marriage — Pamela M. Kelley

After meeting nurse Cameron Baker in the hospital, Ethan White's grandmother added a condition to her will a few days before she died. In order for Ethan to inherit Peppercorn Ranch, one of the largest ranches in the area and where he'd been working since graduating college, he must marry Cameron Baker.

Fortunately, it's only for one month and after the thirty days are up, they can dissolve the marriage and go their separate ways -- and Cameron will have a nice down payment for the condo she's eager to buy. Neither expects the marriage to last a day longer than necessary since Cameron has made it very clear that Ethan is not her type and she doesn't believe that she could ever be attracted to him.