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. Bettina was neither well liked nor
well behaved, and many of her colleagues, associates, and
even her family had good reason to want her dead. Daisy,
determined to help Detective Chief Inspector Fletcher
whether he wants help or not, decides to do some
investigating on her own. But with so many suspects, the
murderer may well go free...