On Halloween, all across the universe, terrifying forces are stirring. The life of Dan Lewis is about to change forever. Why is the Doctor chasing Karvanista? What is the Flux?

In 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?

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

New Year’s Eve. Sarah is working - again. Nick is her only customer - again. Same old same old. Except this year, their countdown to midnight will be the strangest and deadliest they have ever known. Why is an executioner Dalek targeting these two people, in this place, on this night? Why are they having to live through the same moments again? Can the Doctor, Yaz and Dan save them and survive into the New Year?

Who is attacking a speeding bullet train on the edges of a distant galaxy? Why are seismologists going missing from 21st century Earth? Who is defacing some of history’s most iconic paintings? Why is a Dalek trying to make contact with the Doctor? And just what hold does the mesmeric Rasputin have over Tsar Nicholas in 1916 Russia? In her last adventure, The Thirteenth Doctor must fight for her very existence, against her deadliest enemies: the Daleks, the Cybermen and her arch-nemesis, the Master.