In the far future, at the edge of the galaxy, there is a gleaming, perfect city. This brand new human settlement is said to hold the secret of human happiness - but the only smiles the Doctor and Bill can find are on a pile of grinning skulls. Something is alive in the walls, and the emojibots are watching from the shadows, as the Doctor and Bill try to unravel a terrifying mystery...
The Haereticum holds an ancient book known only as The Veritas. Throughout history, anyone who has ever read it has immediately taken their own life. When a new translation is online, spreading danger, the Vatican appeals to the Doctor for help. Will he read The Veritas? But can even the Doctor survive the ultimate truth?
Earth is invaded and Bill is living alone in occupied Britain. The Doctor appears to be on the side of the enemy, flooding the airwaves with fake news. Bill and Nardole embark on a deadly mission to rescue the Doctor and lead the resistance against the new regime, whatever the cost.
A long time ago, the Roman legion of the ninth vanished into the mists of Scotland. Bill has a theory about what happened, and the Doctor has a time machine. But when they arrive in ancient Aberdeenshire, what they find is a far greater threat than any army. In a cairn, on a hillside, is a doorway leading to the end of the world.