Mackenzie and Landon were the perfect couple...until he dumped her and broke her heart. Fast-forward a year, and they're back where they first met: Serenity Ranch and Spa, where they are once again working together for the summer. Talk about awkward. Then Landon takes a nasty fall and gets amnesia. Suddenly, he's stuck in the past. His most recent memory is of last summer, when he and Mack were still together, so now he's calling her pet names and hanging all over her. It's the perfect chance for revenge. The plan is simple: Keep Landon at arm's length, manipulate him so he's the one falling in love, and then — bam! — dump him. There's just one little problem: Mack must make absolutely sure that she doesn't fall for Landon all over again.