Requiem for a mezzo

With dashing Scotland Yard detective Alec Fletcher at her side, Daisy Dalrymple is enjoying a splendid performance of Verdi's 'Requiem' featuring her neighbour Muriel Westlea's celebrated sister, Bettina. But the show comes to an abrupt end when what emerges from the star's gifted vocal chords is a dying gasp. Daisy investigates.