In 2098, Daniel Combs is a scientist driven to help humanity with his ideas. Being involved with META, he’s able to exercise those ideas and has the opportunity to go to one of Jupiter’s moons himself on a mission with the company's AI, Abby, working as his companion and research partner. First, he must undergo a standard psychological isolation test to make sure he’s qualified and mentally prepared.
The day he’s set to be released from the isolation pod, he’s told by Abby that he hasn’t been in the pod for the last two years but in fact, on Europa conducting the actual mission. His real stay in the test pod gave him reservations about leaving his family; so it was decided by himself and META to reset his memory to the original test date in order to keep anxiety down and perform efficiently. It’s further revealed that he’s been resetting his memory every two years to stay sane after discovering the return shuttle’s thrusters froze over, leaving him stranded on Europa for almost a decade.
Trying to keep from resetting his memory again, Daniel sets out to find a way home and develops an intimate relationship with Abby in the process. As time passes, paranoia builds and Daniel realizes there may be more to Abby than he originally thought. Determining what’s real and what’s not could mean the difference between life, death and maybe getting home.