May 4th, 1970. A week earlier President Nixon has ordered American ground forces into Cambodia to pursue the Vietcong. By the end of the day four students will be shot dead by the National Guards in the grounds of Kent State University. On the other side of the Atlantic, it's a brilliant sunny morning after an April of heavy rain, and at the "Concept House" therapeutic community he has set up in the London suburb of Willesden, maverick psychiatrist...