Darius Cranford, testing out a new experimental wormhole generator in a one-man AI powered pod in the year 2107, suddenly finds himself tossed back to the year 1965. But it's not his 1965 (which is our 1965), but a completely different one, where humans have a much larger presence in space due to the accidental discovery of an FTL drive in the early 1950s.
The universe isn't that different than his old one, so he and his AI quietly build themselves a corporate empire based in Philadelphia. Fast forward to 2012.
Then he discovers that he possibly can get home when he learns of an artifact discovered on one of the colony worlds (American Centauri, orbiting Alpha Centauri B) resembles the wormhole generator. So he sends his favorite "researcher" Kamal Hana'a to go acquire it for him. And THAT is where the story really begins.