Bombay, 1950. For over a century, one of the world's great treasures, a 600-year-old copy of Dante's 'The Divine Comedy', has been safely housed at Bombay's Asiatic Society. But when it vanishes, together with the man charged with its care, British scholar and war hero, John Healy, the case lands on Inspector Persis Wadia's desk. Uncovering a series of complex riddles written in verse, Persis - together with English forensic scientist Archie Blackfinch - is soon on the trail. But then they discover the first body. As the death toll mounts it becomes evident that someone else is also pursuing this priceless artefact and will stop at nothing to possess it.