The Glentarry Diet is a funny, strange, and offbeat story about business, love, and most of all luck. Karl Clayton is a management consultant working in London in the early 1980s. His life and chances for happiness become inextricably intertwined with his girlfriend Penny and her British working-class ne'er-do-well friends. Karl needs a lot of luck to win the client by saving it from certain business annihilation. Karl also needs a lot of luck to get the girl and avoid his fate of living out his life in Elmira, New York, divorced, alone, and working in a dead-end job. That is, if he survives the hotel fire and IRA bombing near the tube station. Many forces are allied against his success with either the client or the girl, but unbeknownst to anyone, even Karl, Glentarry whisky becomes his secret ally. With the help of Glentarry, Karl just might save the day for himself, Penny, Penny's friends, and his client.