The time: the earliest years of the 20th century. The place: New York City. Inventor Nikola Tesla is at war with his rival Thomas Edison. However, there's an even greater threat in their midst.
Having decided that everyone could do with a holiday, the Doctor takes Graham, Yasmin, Ryan to a luxury resort for a spot of rest and relaxation. However, they discover the place where they are having a break is hiding a number of deadly secrets. What are the ferocious monsters that are attacking Tranquillity Spa?
A terrifying plan to destroy humanity is about to reach fruition. Can the Doctor and her companions escape multiple traps and defeat a deadly alliance?
When intelligence agents around the world are under attack from alien forces, MI6 turns to the only people who can help: the Doctor and friends. As they travel the globe looking for answers, attacks come from all sides. Earth’s security rests on the team's shoulders, but where will this planet-threatening conspiracy lead them?