The titular rule goes like this: If you are 100 miles away from your wife, cheating doesn't count. Yeah, right! It doesn't take a genius not to want to play by this risky proposition, and Bobby (Jake Weber) is too smart to risk it all … that is, until he meets Monica (Maria Bello). One ill-advised night of passion leads to blackmail, and now Bobby must decide whether his marriage is worth committing murder.