Appearing as if from nowhere, Michael Hollingshead turned Timothy Leary on to LSD in 1962, later traveling to London to establish a cultural beachhead for Leary's LSD philosophy at the World Psychedelic Centre. Following a spell in prison—where he dosed KGB spy George Blake—Hollingshead established a commune, created the first electronic I Ching installation, spent time in Nepal, and allegedly died in Bolivia in the 1980s. Was he a guru or a con man? Looking for answers, Andy Roberts follows the trail of one of psychedelia's key figures.