History is turned inside out when off-world travellers challenge Tyson Reyes and Madi Grace to a real-life game of Temporal Dilemma. Three rounds from the opponents and Hitler takes Europe, Pearl Harbor never happens, a fascist cloud hangs over the post-war United States and Chronos itself is erased from existence.

Now Tyson, Madi and a team of seasoned players must make their moves - in 1930s New York. Jazz and the blues waft from Village clubs. The World’s Fair draws assassins. Madison Square Garden hosts Nazis. And the Manhattan Project never gets off the ground.

Tyson and Madi have only three days to undo the strategy that changed the tides of war and the fate of the world. A surprise survivor from Chronos could be their best hope for flipping the timeline. If he’s on their side. But can they risk trusting him when the past, the future and the lives of millions hang in the balance?