Passenger 961

In 2027, Passenger 961, a private investigator, December Damuzo, goes on a holiday trip with his family of four in an ocean liner. For mysterious reasons the ship and everyone in it find themselves on a future Earth, thousands of years into the future. Everything has changed since 2027. People live in generation ships, spread throughout the galaxy, and heavily-fortified settlements because numerous aliens from the neighboring Andromeda galaxy want them dead. An Artificial General Intelligence is tasked with teaching Passenger 961, December, about history.
Plus, she must find out what has happened to the Passengers. Who transported them to the future and why? A superior Artificial Intelligence suspects foul play. Perhaps the Passengers are not who they say they are. Could they be powerful enemies in disguise?