The British film industry made hundreds of thrillers in the 1950s but very few are memorable,but this is definitely one.I have just seen this again after some years.I consider it the perfect murder mystery for a number of reasons.Firstly every detail of the plot has a crucial impact in the climax,not least the hit and run accident.Every piece of the plot falls neatly into place.Patricia Dainton is able to use the details of the conspiracy to her advantage.The plot itself is uncomplicated and the story very well written.Well worth viewing when contemporary films have faded from view.Can be viewed on TV again for the first time in years.