With a libretto by the distinguished crime novelist RN (Roger) Morris, this is an intriguing Cocteau-esque opera that resists reaching for easy harmonic comforts, but is by no means rebarbative in its musical garb. And there is no gainsaying the vocal skills of the persuasive soloists, notably the mezzo-soprano Lucy Williams, who characterises her role with conviction, ever-mindful of Morris’s text.