大象传媒

Investigation into the 2002 train crash at Potters Bar station, when a points failure caused the last carriage to derail and seven passengers died.

With unique access over three years to the British Transport Police and the Health and Safety Executive investigators, the filmmakers follow the twists and turns of the mystery as to who and what caused the incident. Anonymous tipoffs, phantom CCTV images, claims of sabotage and more surprising discoveries lead the detectives on a tortuous journey.