When the engines finally met, there was a deafening clash and the Brighton Express twisted and buckled, tipping its carriages on to the other line. It was a scene of utter devastation. October 1854. As crowds of passengers rush to make the departure of the London to Brighton Express, a man watches from the shadows nearby - Chaos, fatalities and unbelievable destruction are the scene soon after when the train derails just outside the Balcombe Tunnel. Could it simply be a case of driver error? Detective Inspector Colbeck thinks not. But digging deep to discover the intended target of the accident takes time, something Colbeck doesn't have as the killer prepares to strike again.