May 17th 1944: A squadron of Hurricanes shoots down an unidentified aircraft over the Dorset village of Turelhampton. A routine operation. So why is the village immediately evacuated?
2001: Troops still occupy Turelhampton, guarding the village's dark secret. When a television documentary crew break through the cordon looking for a story, they find they've recorded more than they'd bargained for.
Meanwhile, in Cornwall, a journalist is witness to a terrifying ceremony: agents of the worst evil in history plan to unleash a new, unthinkable horror on the world.
Caught up in both a deadly conspiracy and historical mystery, retired Brigadier Lethbridge-Stewart calls upton his old friend the Doctor. Half-glimpsed demons watch from the shadows as the Doctor and the Brigadier discover the last, and deadliest, secret of the Second World War.
This story features the Sixth Doctor and the Brigadier.