Requiem for a Mezzo

In March 1923, the Honourable Daisy Dalrymple takes a break from her writing to attend a performance of Verdi's Requiem at the Albert Hall with Scotland Yard's Detective Chief Inspector Alec Fletcher. The tickets are a gift from Muriel Westlea, Daisy's neighbor and the sister of Bettina Westlea, who will be singing the mezzo role. What should be a pleasant afternoon is quickly disrupted when, during the performance, Bettina falls dead on stage—killed by cyanide poisoning. While it is quickly determined that Bettina's on-stage glass of liqueur was laced with the poison, discovering the person responsible will not prove to be an easy task.