In early July of 1947, something crashes in Roswell, New Mexico. The military claims it's a weather balloon. Witnesses insist they've seen bodies of aliens, and the wreckage of a UFO. Sixty-eight years pass. On September 15th, 2015, a massive nuclear exchange between Russia and the United States leaves five billion dead. All that's known is that the Roswell UFO wreckage was somehow involved. Another eighty-three years have passed. Project T.I.T.O.R. is a reality. Hop machines are created by top quantum physicists Ephraim Caine, Jeff Waldron, and Rose Rios. These complex crafts are designed to do one thing: penetrate the time barrier. Time is short. Earth; wounded, post-apocalyptic, with her dwindling resources on the verge of exhaustion, can barely support life. Project T.I.T.O.R. has a singular focus: to send hop crews back through time, and find some way to stop the nuclear exchange. To find some way to save the Earth. After more than two hundred routine missions, one goes awry, and in a mind-bending twist of fate, Hop 206 tumbles from the sky, crashing near Roswell, New Mexico, in early July of 1947, triggering the very historic events that project T.I.T.O.R. was meant to preclude. With everything stacked against them, can they succeed in changing history? Or will time prevail, blocking every effort to change it, and eliminating humanity in the process?