Mark realises that he has made a potentially embarrassing mistake: there is a difficult-to-explain entry on his wife's credit card statement. He turns on the charm with a young woman, Jo, who works in a call centre, to see if she can make it disappear. But this is not just a domestic embarrassment for Mark: his wife Eve is a senior policewoman, very much in the public eye, and the force is about to conduct an enquiry of expenses.