The Direct Ascension Series Hellbound Book One

2,000 years from now, an alien King controls Earth. His young human Queen, Celeste, is beautiful and powerless. She hasn't yet discovered a gift that lives inside her.
Deep in the Andromeda Galaxy, a telepathic master assassin, Sebastian Raynes, has one final mission - kill the King of Earth, then kill himself.
But when the queen sees the assassin murder her husband and then asks him for help to leave her Kingdom - both their plans for the future change.
The queen and the assassin find a love that could shape the course of the universe. But constant reminders of the ghosts of his past and threats to her life now are endangering their future.