In 2055 Chicago, Charles Hatton profits from “Time Safari,” a business allowing wealthy hunters to travel back in time to kill dinosaurs before their natural deaths. When scientist Travis Ryer notices strange changes in the weather and wildlife, he turns to Dr. Sonia Rand, the inventor of the time-controlling supercomputer. They soon face worsening “time waves” that cause evolutionary distortions. As they race to fix the past, each attempt becomes more difficult as their present unravels.