A man who is believed to have murdered a woman, escapes from the insane asylum to find if he was the one to actually kill her using the scarf she was wearing.

It is pouring with rain at one minute to midnight on Friday the thirteenth, and the driver of a London bus is peering through his blurred windscreen as his vehicle sails down an empty road. Suddenly, lightning strikes, and a vast crane above topples into the path of the oncoming bus... Then Big Ben begins to wind backwards. Time recedes. And we discover the lives of all the passengers and the events that brought them to that late-night bus journey, from the con-man with a hundred-pound cheque to the businessman's distraught and elderly wife. Time flows on, inevitably, to the crash -- and past it, as some live and some die.

Davey Fenwick leaves his mining village on a university scholarship intent on returning to better support the miners against the owners. But he falls in love with Jenny who gets him to marry her and return home as local schoolteacher before finishing his degree. Davey finds he is ill-at-ease in his role, the more so when he realises Jenny still loves her former boyfriend. When he finds that his father and the other miners are going to have to continue working on a possibly deadly coal seam he decides to act.