Psilocybin. LSD. Ketamine. MDMA. These are the drugs that will change mental health treatment forever. We're on the cusp of a psychedelic revolution. But how did we get here? This book examines the long, turbulent history of psychedelics, from their ancient and spiritual roots to their peak during the 1960s and their fall in the subsequent 'War on Drugs' to their new rise in the labs of today and tomorrow, asking the question: how can these mind-altering substances alter the world for good?