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In the near future, a civil servant is offered the salary of her dreams and is, shortly afterward, told what project she'll be working on. A recently established government ministry is gathering "expats" from across history to establish whether time travel is feasible--for the body, but also for the fabric of space-time. She is tasked with working as a "bridge": living with, assisting, and monitoring the expat known as "1847" or Commander Graham Gore....

"Once, military actions were entirely two dimensional, confined to the surface of land and sea, but then submarines and aircraft added a third dimension, vastly extended by spaceflight. Now, consider that if time travel is possible, the fourth dimension of time opens up new possibilities for combat -- necessitating new defenses, new strategies and tactics. A battle that was once decisively won might be refought, or a narrow victory might be subtly...

Have you ever wondered what the Doctor is actually talking about? Are you burning to find out what the Blinovitch Limitation Effect is? Or what regeneration really is? In this book, the Doctor takes you through all those tricky Time Lord words and phrases to teach you everything you need to know for travelling through time and space in the TARDIS with him.