In 1926, Agatha Christie disappeared for 10 days. Was it amnesia? A nervous breakdown? Or a Giant Alien Wasp..? As Russell T Davies's Bafta Award-winning time-travelling drama continues, the Doctor and Donna join forces with the world's most famous crime novelist to encounter a body in the library, poisoned cocktails and a Vespiform seeking revenge.

David Tennant plays the Doctor and Catherine Tate plays his companion Donna Noble, with guest stars Felicity Kendal and Fenella Woolgar.