You don’t need to know the opera Tosca to understand and enjoy this book about Puccini’s most notorious villain, Vitellio Scarpia, portrayed on stage as a ‘sadistic agent of reaction’, a cut-throat murderer who enjoys drinking his victims’ blood from their skulls and, as one of my opera-loving Kensington pals puts it, ‘not a nice bloke at all!’

In fact you may not even recognise him in these pages.