Veteran TV talk-show host Patrick Sumner is desperate to impress his new producer Reg Godfrey, who visits Patrick's smart London flat for drinks. But Patrick reckons without the intervention of Jenny, a pretty girl who arrives on the same evening as Reg, intent upon infiltrating Patrick's private life and even passing herself off as his wife. When Patrick's real wife returns unexpectedly from a Paris trip, Patrick is forced into a spiralling series of lies and subterfuge.