Alfie and Caroline are celebrating. Tomorrow, they’ll go down to the enormous red desert planet they’re orbiting, restart the electric dynamo at the planet’s core, and create a new habitable planet for humankind. Yet when Alfie awakes the next morning, Caroline is nowhere to be found. Alfie descends to the barren planet and discovers a tear in the spacetime continuum, allowing them to clamber into Caroline’s memories in search of her. As they chase an elusive Caroline through time, they receive more questions than answers — why won’t she let Alfie find her, and who is this other stranger in her memories?