In the dizzying third (and probably not the last) installment of a steampunk/alternative-universe/time-travel saga, polymath explorer extraordinaire Sir Richard Burton returns with his trusty sidekick poet Algernon Swinburne to pre-empt a royal assassination, prevent world war, recover a set of psychoactive diamonds deposited by a now-extinct non-human race of super beings, and defeat the powers of evil. Burton hops between alternative realities in an enthralling tale replete with an encyclopedic grasp of period detail. Thoroughly engrossing.