The year is 1969 and ten guests are about to enjoy a country house weekend at Tavistock Hall. But one amongst them is harbouring thoughts of murder. . . The guests also include the young detectives Arthur Bryant and John May undercover, in disguise and tasked with protecting Monty Hatton-Jones, a whistle-blower turning Queen s evidence in a massive bribery trial. Luckily, they ve got a decent ch...