The Philosopher's Stone is the Holy Grail of alchemy, the ancient art of turning base metal into gold. Its magical and elemental power has fixated explorers, occultists and scientists for centuries. For the Philosopher's Stone, it is said, holds the key, not only to making gold but also to deciphering the riddle of existence and unlocking the secret of eternal life.

Following such luminaries as Newton, Jung, St Thomas Aquinas and Zosimus, who devoted most of their lives searching for it, Peter Marshall set out to unearth the secrets of alchemy in the lands where it was traditionally practised. The result is fascinating piece of historical, scientific and philosophical detection, as well as an exciting physical and spiritual adventure.

Exploring the beliefs and practises, the myths and the symbols of the alchemists, Peter Marshall takes us on an enthralling journey through the western and eastern worlds.