Barrister Alan Hitchcock is put out to grass by his firm, his wife and his children. A lifetime's work all for nothing. His circumstances lead him to a room at SummerVale, retirement home for the elderly. The last 'lag' he defends tells him a story about the perfect job he never got to do. 'H', as the lawyer is known, can';t get this story out of his mind while adjusting to his new life. At SummerVale he finds a group of like-minded people, discarded, disillusioned, downtrodden but not yet dead. He galvanises these old people into raising their expectations and convinces them that they can have a happy, wealthy retirement if only they can pull off a daring robbery! The scam involves diverting a small plane, landing another in its place and stealing the ill-gotten gains of rich people who use this route to escape paying tax on their money and possessions by smuggling their wealth to a Swiss tax haven. A robbery without violence, stealing from people who won't go to the police to complain. A robbery by O.A.P's. Who would ever believe it?