When her dad and his annoying girlfriend announce their engagement, Chris Wilson isn't exactly thrilled. As if getting roped into bridesmaid duty for a future step-mom she can't stand isn't bad enough, Chris is stunned when Marsha accuses Chris's deceased mother of trying to ruin the wedding.

Certain their mother moved on to the Great Beyond long ago, the Wilson sisters investigate who—or what—is really out to get Marsha. With marriage fever making everyone crazy, can the sisters get to the bottom of this haunting in time to save the wedding? And do they even want to?