TimeRiders: City of Shadows is a book written by Alex Scarrow and published in 2012. It's story revolves more on the main story arc then in previous instalments in the series.
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At the beginning of City of Shadows, Liam, Sal, Maddy, Bob, Dr Anwar, and assistant robot Spongebubba arrive back in 2001. Maddy gets Computer-Bob to force reset the time bubble back to monday morning, she then proceeds to meet Foster at his park bench in Central Park, to ask him to run away with them. He says he can't go back into the time bubble, for fear of being attacked more by the small amounts of Tachyons inside the time bubble. She says they won't need one where they going, and after small persuasion, he relents and goes back into the Archway with her, to prepare for their expedition.
Back in 2054, Joseph Olivera is in shock after his co-worker Frasier Griggs is mysteriously killed in a suspicious car robbery by flood migrants (people that became nomads after their countries were flooded by rising waters caused by the polar ice caps dramatic melting caused by the incredulous increase in global warming) after a heated arguement with Roald Weinstein. He notices that Griggs had left his favourite memo-pen in his coffee mug, which highly contrasts with his obsessive compulsive habit of protecting it more than life itself. He picks it up and opens the unprotected last broadcast, a memo for him in which Griggs' is slurred. In it Griggs says "Weinstein's gone crazy, you are the only way of stopping him, Joseph. He'll do away with me soon!". This causes Joseph to become very cautious around Waldstein, and along with the "Sal-Unit", sends her with the memory of being saved in a fire, he also includes the little messed-up bear from the antique store they visited weeks ago. For one reason, to get her to question herself, to reach the ultimate conclusion that...(Spoiler Alert!!!)
In 2001, the crew prepare to run, its Monday afternoon, and after the six support-units go back in time to kill them, they know that they aren't safe in the archway anymore. They also know that it is a matter of time before the two support units; Abel and Faith, arrive back at the archway after being transported to a random location by Computer-Bob, (transported, where no time travel is involved...), they find an old RV on short notice, pack up the "time machine", and other technological goodies, and begin to drive to Boston, where Maddy believes she can get help from her 9 year old self's parents.
- "The Department" from Alex Scarrow's adult fiction book A Thousand Suns is featured in this book. Wallace and the file N-27 are also mentioned. Scarrow also mentions Peak Oil, from an