SUSSEX, ENGLAND, 1929.Mydworth is a sleepy English market town just 50 miles from London. But even in this idyllic spot, crime is never far away... Luckily the young and adventurous Sir Harry Mortimer has returned to Mydworth from his diplomatic posting in Cairo, with his unconventional American wife, Kat. And between them they are a match for anything - even murder.MURDER WORE A MASKLavinia's annual Masked Ball at Mydworth Manor is a highlight of the season, as locals mingle with the great and famous from London. But the lavish party comes to a full stop when one of the guests is found dead, down by the lake. It seems it's a clear case of a heart attack. But Harry and Kat suspect that the dead man in a mask was in fact the victim of a clever case of murder. And the killer's work at the party is not yet done...