They're headed for disaster in a race against love.Racecar driver Stone Adams likes fast women and faster cars, but his playboy lifestyle isn't making his sponsor happy. In an attempt to please the money men, Stone marries a woman in Vegas in a spur of the moment ceremony. But when he shows up at his new bride's house, he discovers she has a fiancé she neglected to mention --and a younger sister who finds the whole situation hilarious.Younger sister Grace Cromwell has always been the one to bail her big sister out of scrapes and jams. This time her sister went too far, marrying a man she just met in Vegas. Grace doesn’t want to help this time. However, when a photo of Grace and Stone ends up splashed across the front page of a newspaper, she's mistaken for his wife. It was only logical she would continue the charade so her older sister could continue with her wedding plans.Finally, after a lot of pleading, Grace agrees to play the part of Stone’s wife in public. So why is she having such a hard time remembering it’s all a charade?