From the BBC and the Universe of Doctor Who. Like all teenagers, the students at Coal Hill Academy have hidden secrets and desires. They are facing their own worst fears, navigating a life of friends, parents, school, sex, sorrow - and possibly the end of existence. The very walls of space and time are starting to thin. Something is pressing on the other side: something waiting for its chance to kill everyone and everything, to bring us all into Shadow. Fear is coming. Tragedy is coming. War is coming.