The history of an obsession that once shaped the world. In the ancient Egyptian temple of Dayr al-Bahri is preserved the earliest surviving representation of a merchant fleet. Date to around 1495 BC, rows of hieroglyphs record that the pharaoh Queen Hatshepsut sent the fleet 1,900 miles south to the land of Punt, a mysterious kingdom somewhere in the Horn of Africa, whence it returned in triumph with a priceless cargo of cinnamon. Yet cinnamon never grew there; it comes from the islands of Southeast Asia; the scarcely credible conclusion is that by 1500 BC there was a trade in cinnamon from one side of the Indian Ocean to the other. At some unknown place, the long-forgotten merchants of Punt acquired the spice, and then resold it for the use of the embalmers, cosmeticians, priests, gods and god-kings of the Nile. These hints of an ancient trade in spices are only the first, tantalisingly obscure fragments of an epic story.