The time and place
The future, on various planets, spaceships, and nebulae. See the title.
The suspension of disbelief
Space travel exists. Long ago, people fled Earth after nuclear war, scattering its treasures and museum pieces everywhere. Those are now valuable. There are several humanoid races around, perhaps all descended from us.
The quick summary
Dr. Eos Rai, an astro-archaeologist at the Galactic Institute for Historical Preservation, is desperate to find Star’s End and a piece of the Mona Lisa. She can’t secure the Institute’s help, so she recruits a notorious band of treasure hunters, the Phoenix brothers. As they search, she gets involved with Dathan Phoenix, but to what end?