Tune in, turn on, drop out. So said Timothy Leary, global figurehead for 60s psychedelic culture and 'the most dangerous man in America' according to President Nixon. A psychologist at Harvard, Leary was forced to leave when he started to dedicate his efforts to researching LSD and other psychedelic drugs, a vocation which changed an entire generation. John Higgs' incredible biography reveals the stranger-than-fiction true story of one of the most divisive figures of the twentieth century.