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...