"The equations required for time travel are relatively simple. What is immensely difficult is moving simultaneously through space so that you arrive not just when you want, but where." Jessica McKenzie, PhD. Applied Physicist When war-hero turned anthropologist Robyn Hood learns that time-travel is real, she jumps at the chance to visit the very time and people that drew her to this profession: The Celtic people of Britain in the first century. Little does she know that her team will land in the middle of a battle, and she will be called on to rescue the very people she came to study.