A time traveler has 7 days to save the world, but an evil lurks in the shadows. Billions will die in a single instant, on a fateful day in the far future. A nefarious entity is concocting this doomsday. Tej, a time traveler, decides to prevent the apocalypse.
Other books from this series are available here.
Demons of Time: Race to the Seventh Sunset (Time Travelers Book 1)

Fantasy