The Ten Teacups

'There will be ten teacups at number 4, Berwick Terrace, W.8, on Wednesday, July 31st, at 5 p.m. precisely. The presence of the Metropolitan Police is respectfully requested.' The note was delivered to New Scotland Yard, its words evoking a cold murder case and its unsolved mystery of the ten teacups found beside the body. Scrambling to prevent a second killing, the police set up a watertight cord...