Historian David Marcus spent his entire life studying one single day. In 2010, the prime minister of Israel was assassinated in what was dubbed the "Longest Day in History." The events that followed were linear, ominous and unstoppable as the nuclear weapons were launched. Life existed for decades before a major break through occurred. After years of looking to the stars for a new planet, scientists found that is was possible for one-way time travel through a rift in our solar system. Instead of finding a new world, what if a team was able to stop the "Longest Day in History?" What if we could go back in time to save our planet?