In the far future, an invention called "the prism" uses quantum mechanics to cause divergences in future timelines and create a means of communication across these alternate realities. Two different women explore the choices they have made in their own lives and the regrets they harbor--and have to figure out how to ultimately make peace with their decisions.

For one man, the world turns upside down when his girlfriend breaks up with him, and for everybody else, the world literally turns upside down in a deadly, catastrophic reversal of gravity.