A week-long respite from a prolonged and bloody war, the Festival of the Twin Moons of Tuin makes Glastonbury look like a church fete... or so the brochure says. The Doctor and Ace are looking for rest and recreation. Hex is looking for the beer tent. But eternal enemies the ginger-haired Ri and the coot-bald Ir are plotting to turn their Festival truce to their own advantage. Only the Dark Husband might stop the celebrations turning to horror... but who is the Dark Husband? And what terror awaits him on his wedding night?