In Kat Garcia's twenty-second century world only the Rocky Mountains are above sealevel, and the sun is hot enough to kill anyone who ventures outdoors. Kat goes through a portal seeking bullets to arm herself and keep her friends safe from the decayed remnants of the government.

In Kaitlin Garcia's world, the Unified States is constantly bombarded by severe storms. Kaitlin goes through a portal in order to implement her climate mitigation strategy before her world is rendered uninhabitable.

In Katherine Garcia's world, only draconian government control over the citizens has kept the droughts, floods, and diseases from killing them. Katherine goes through a portal seeking nuclear fusion, the key to throwing off the oppressive governmental yoke.

When the actions of the three Kats start to unravel their universes, can they join forces and save them all?