One evening in 1969, a Ministry of Defence's facility in London is completely destroyed by a huge explosion. To their surprise, Danny (Jack Huston) and Kenny (Ray Winstone) come into possession of a strange object from the blast; a large lump of solid Uranium which looks remarkably like a hot potato.
The pair quickly learn of their find's potential worth as well as its radioactive dangers. With the aid of Danny's girlfriend, Carole (Lois Winstone) the three set off on an adventure, dodging police and other sinister criminals also on the hunt for this prized find.