At Halloween, all across the universe, terrifying forces are stirring. From the Arctic Circle to deep space, an ancient evil is breaking free. And in present day Liverpool, the life of Dan Lewis is about to change forever.

During the Crimean War, the Doctor discovers the British army fighting a brutal alien army of Sontarans, as Yaz and Dan are thrown deeper into a battle for survival. What is the Temple of Atropos? Who are the Mouri?

Time is beginning to run wild. On a planet that shouldn't exist, in the aftermath of apocalypse, the Doctor, Dan, Yaz, and Vinder face a battle to survive.

Devon, November 1967. A little girl has gone missing, Prof Jericho is conducting psychic experiments and in the graveyard there is one gravestone too many. Why is Medderton known as The Cursed Village and what do the Weeping Angels want?

As the forces of evil mass, the Doctor, Yaz and Dan face perilous journeys and seemingly insurmountable obstacles in their quest for survival.

In the final epic chapter in the story of the Flux, all hope is lost. The forces of darkness are in control. But when the monsters have won, who can you count upon to save the universe?