A group of the four main people in charge of the crew of the satellite space habitat known as Arcadia. 

This satellite is created as part of the Axis Mundi project, a program meant to help preserve humankind as the world devolved into a nuclear apocalypse. However, the satellites created for this project were not meant to last, made only so those in space could survive the ending blows to the earth.

The space habitats are now going down one by one as their expiration dates approach, and the four highest ranking crew members must figure out how to deal with a dying spacecraft.