Ellie Hamilton has been painstakingly planning her sister's destination wedding for the longest time. As guests arrive on a beach paradise, Ellie runs into her ex-boyfriend, Greg, who also happens to be the best man. When the bride and groom don't show up, Ellie and Greg must lie to the guests and assure everything is okay. With the wedding a couple days away, and Ellie unsure if her sister will show up, she and Greg must save the wedding while simultaneously falling for each other.