It was hardly a typical drugs bust. When police from around the country swooped before dawn on Tregaron one morning in 1977, dozens of the 800 officers working the case looked like unshaven, long-haired hippies plucked from the audience of a Pink Floyd gig.
And the vast LSD co-operative they were targeting was, if anything, even more unconventional. It's leading members included doctors, scientists and university graduates - motivated, they insisted, by an evangelical drive to transform human consciousness itself.
An anarchic play with music from the 70's prog-rock that casts fresh light on an undercover operation that smashed one of the most extraordinary drug rings the world has ever seen and changed British policing forever.