It's Sarah's 45th birthday, and her husband, Ben, jokingly says that she is stuck with him, because the chance of a woman her age finding a new man, is smaller than being attacked by a terrorist.
Sarah, who finds this statement both insulting and depressing, proposes a bet: they will separate for three months. During those three months, they will both be free to explore other sexual partners and prove to each other that they are still attractive to others. Together they set down the rules: they will tell no one, they will not date any of their mutual friends, and they most definitely will not fall in love. Thus begins “The Bet".
The happy couple begin their exploration of love and commitment, sure they will succeed. But very soon, they discover that rules are made to be broken and a Pandora box once opened, cannot be closed.
