A goods train speeds through the Sapperton Tunnel, but disaster strikes before it can reach the other end as it collides with an unusual blockage on the line: seven sheep penned onto the tracks. Specially requested to investigate the carnage in Gloucestershire, Inspector Colbeck and Sergeant Leeming are confronted with a bizarre case unlike anything they've encountered before.
Stephen Rydall, a director of the Great Western Railway, is convinced...