The Shadow in the Glass by Justin Richards

The Shadow in the Glass is a Doctor Who novel featuring the Sixth Doctor. In 1944 a squadron of Hurricanes shot down a unidentified Aircraft over the dorset village of Turelhampton. 57 years later and the village is still occupied, guarding a dark secret from prying eyes.

When a TV crew sneak through the blockade, the find more than they ever 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 upon 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.