It begins with a death: Sally's father has drowned at sea. Then Sally receives an anonymous letter. The dire warning it contains makes a second man die of fear at her feet. How did her father really die? The search for the truth plunges Sally into a terrifying mystery at the dark heart of Victorian London. One that reaches from a Maharajah’s Indian palace to the opium dens of China. At the centre of which glitters a deadly blood-soaked jewel…