Andrew Crowther, a wealthy retired manufacturer, is found dead in his seat on the 12.30 flight from Croydon to Paris.Rather less orthodox is the ensuing flashback in which we live with the killer at every stage, from the first thoughts of murder to the strains and stresses of living with its execution. Seen from the criminal's perspective, a mild-mannered Inspector by the name of French is simply another character who needs to be dealt with.