Loss of Eden is the third book of the Antarean Odyssey
The ending of childhood might feel like the loss of Eden: it is time for the four to meet the world. This story is about an expedition that goes terribly wrong. Sabrina races home against time and death to find a deserted ship, the Antares only manned by androids.
Sargon is in the Pleiades, on a planet called Acheron. When she finds him, she is informed that instead of going home she is to attend a university to become an accredited engineer, a command officer in the Starfleet of the Planetary Alliance, and an interstellar lawyer.