The year is 2055 and onboard the Hermes IM-950, Integrity 6 - a mission to Mars to document complex lifeforms - is in full swing. Callisto heads a team studying samples being retrieved and Rigel is working to keep the crew healthy.
Altair is a member of the team keeping the computer system vital to the Aether Orbital Research Station up and running, where Hermes IM-950 is scheduled to stay for 3 weeks on the return trip.
Something is on the space station, leaving very few survivors. The computer system has been broken. With no way to contact Earth, the survivors have to use their wits to survive and tolerate each other. Because, out of every person on this space station it did just have to be them that survived together, didn't it?