Dorothy Martin and her husband, retired Chief Constable Alan Nesbitt, are invited to join their close friends Nigel and Inga Evans at a Welsh music festival. Amid the glorious surroundings of Welsh castles and the history of long-ago battles, the stage is set for an enjoyable event. However, when a tragic accident takes the life of one of the choir, and the same fate befalls the star soloist, Dorothy and Alan find themselves in the midst of an investigation...

For three days in August 1969, nearly a half-million young people descended upon Max Yasgur's farm in upstate New York for the rock 'n' roll event that defined a generation. Mythologized for 50 years, the filmmakers set the record straight with the most comprehensive examination of how the festival came to be using original interviews with key figures, rare archival footage and unearthed photographs.