In the summer of 1965 the informal parties that Ken Kesey was holding at his house in Palo Alto California were about to evolve into what became known as the Acid Tests. These spontaneous anarchic gatherings spread their tentacles far and wide until an entire generation seemed to be under their spell. Fifty years on from the Merry Pranksters multimedia mayhem, acclaimed author Rob Chapman explores in crystalline detail the history, precedents and cultural impact of LSD, from the earliest experiments in painting with light and immersive environments to the thriving avant-garde scene that existed in San Francisco long before the Grateful Dead and the Fillmore Auditorium. In the UK, he documents an entirely different history, and one that has never been told before. It has its roots in fairy tales and fairgrounds, the music hall and the dead of Flanders fields, in the Festival of Britain and that peculiarly British strand of surrealism that culminated in the Magical Mystery Tour.