Spring 1858. The route of the Caledonian Railway through the southern uplands of the Scottish countryside is disrupted by a fatal crash. Inspector Robert Colbeck & Sergeant Victor Leeming are called from the crime of London to investigate & must contend with old enemy Superintendent Rory Mc Turk to uncover the criminals behind the disaster. The motive for the crash is unclear with suspects including the North British Railway a group of sabbatarians & those with personal vendettas to enact. Colbeck & Leeming face further obstacles when the Railway announces a reward of GBP400 for information
- soon they are pitched against criminals the public & their own colleagues in their attempts to solve the case. Meanwhile with the investigation stalling the newly married Madeleine Colbeck & her father race to reach Inspector Colbeck with important information. Will they be in time to save the royal family before their train journey to Balmoral?