Seventeen-year-old Alexa enters a strange tunnel on a nameless road; and her life changes forever. She is sent to the future, where the earth is ravaged by mutated animals and ruled by the Others: monsters that were once human.
Before a mutated dog tears her to shreds, she is rescued and taken to Shelter, where the few human survivors remain.
There, she meets two warrior brothers, Micah and Tane. Micah is warm-hearted and flirtatious, while his brother is mysterious and guarded. Despite her better judgment, Alexa is drawn to the dangerous Tane, but she has bigger problems than unrequited emotion.
Soon, she questions how she ended up in the future. Why did the tunnel choose her, and why are the people of Shelter so welcoming? Tane is entrusted with her protection, but even more questions arise as Alexa begins to suspect the Others are out to get her. Alexa could hold the power to save the human race, but first, she must make a devastating chose that will alter the fate of the world.