After many dangerous journeys and confronting the scariest monsters in time and space, the 13th Doctor finally ushered in her last adventure against her deadliest enemies: Dalek, the Cyberman and her old enemy, the mage. Who attacked a high-speed train on the edge of a distant galaxy? Why do seismologists disappear from the earth in the 21st century? Where on earth are those missing world famous paintings? Why would a Dalek take the initiative to contact the doctor? What unknown story happened between the monk Rasputin and Tsar Nicholas in Russia in 1916? A lot of threats show in front of the doctor, in the face of this life-and-death battle, where she will go.