When a group from the small English town of Bolchester make an excursion to Cannes, little do they expect it to end so dramatically - with the disastrous murder of one of their party, the domineering Alderman William Dawson. Suddenly the holidaymakers find themselves murder suspects. But, with so many grudges borne against Dawson, it becomes impossible to work out who might have been responsible for his death. Was the fact that he had been a traitor...