9 years ago, Julianne Potter and Michael O'Neil made a pact: if they didn't fall in love with someone else before the age of 28, they would get married. Best friends since their student days, who once succumbed to an outburst of passion, almost forgot about their youthful pact. And now, at the age of 28, Michael has popped the question of marriage, but... with another. Julianne, who suddenly realizes she could lose the most important man in her life, has only four days to win Michael back.