Mercury, Venus, Terra, Mars, and Ceres, longtime friends but recently distant, gather to open a letter from Jupiter, the arrogant and power-hungry king of the Gods. They learn that the sun will become a red giant star, soon to destroy their planets. They also learn that everyone else is gone; they are alone in the solar system.

Immediately these immortals face their own mortality. If their planets are gone, do they also cease to be? Do they have a chance to change the course of fate?