Imagine a war. A war that has lasted centuries, a war which has transformed an entire planet into a desolate No Man’s Land. A war where time itself is being used as a weapon. You can create zones of decelerated time and bring the enemy troops to a standstill. You can create storms of accelerated time and reduce the opposition to dust in a matter of seconds. But now the war has reached a stalemate. Neither the Plutocrats nor the Defaulters have made any gains for over a hundred years. The Doctor, Fitz and Anji arrive at Isolation Station Forty, a military research establishment on the verge of a breakthrough. A breakthrough which will change the entire course of the war. They have found a way to send soldiers back in time. But time travel is a primitive, unpredictable and dangerous business. And not without its own sinister side effects...