The Railway ViaductAs a train speeds over the Sankey Viaduct, the dead body of a man is hurled into the canal below. Inspector Robert Colbeck and Sergeant Victor Leeming take charge of their most complex and difficult case yet. Hampered by the fact that the corpse has nothing on him to indicate his identity, they are baffled until a young woman comes forward to explain that the murder victim, Gaston Chabal, is an engineer working on a major rail link in France. As the