After completing a two-year prison sentence for a bribe he didn't take, former DI Alan Lomax wants answers. With at least one luxury left - a narrowboat, and it's on the canals, among the day trippers and travellers, that he means to seek revenge. Not an easy task for an ex-detective isolated on the wrong side of the law.

Dr. Vache has a plan to destroy the world’s economy by flooding it with gold. Spies Gunn and Powder are on a mission to save it.