Jack is having a crisis of confidence. While working in a lowly city estate agents he dreams of bigger and better things. When his flatmate, Sam, catches his girlfriend's attempted infidelity, Jack is inspired with a shrewd business opportunity. Together with his quirky flatmates, Jack runs a company to help doubting partners put their lovers' loyalty to the test.

Although it has its obvious negative consequences, the relationship wrecking business is a big success. But just as Jack's friends become increasingly concerned by the moral downsides of their thriving company, Jack finds the woman of his dreams and sees his new found success as a brilliant way to impress her. But will this have the effect he so badly wants or will he end up losing it all? Sometimes it's not so easy to see the difference between the heroes and the villains...