Joan Kepler is an intergalactic postal worker. She's top of her game, a senior deliverer in an industry that's been threatened by newer, faster technologies. Keeping Joan company on her endless missions is her ship, PAT 1. He's laconic, lazy and desperate to retire but remains deeply loyal. Together they've explored the outer edges of the galaxy, all the while preserving their 100% delivery record. But on this job, something's different. Three innocuous packages and a trip into uncharted space: it's nothing she hasn't handled before.

Merald and Shaylyn, two skilled engineers, are part of a pioneering mission to the outer reaches of Earth’s solar system.