Sarah Stevens experiences a bride's worst nightmare: being dumped at the altar. When she goes on the Caribbean cruise meant to be her honeymoon in order to lick her wounds, she discovers her ex-fiancé has sent his brother Will Marshall, the former best man, on the cruise as well. Everyone on board thinks they're newlyweds, and Sarah is too embarrassed to set them straight. There is nothing like a romantic cruise to bring two people together, particularly when they are pretending to be honeymooners. Sarah discovers she is in love, real love. She believes Will cares for her too. But will his loyalty to Brad stand in the way of their happiness? Can she convince Will that he is her best man?