Centauri Dawn: Centauri Series, Book One

Audra is a normal grad student in law school in Boulder, Colorado. Until the day she finds out she isn't. She's a princess from the planet Centauri. Her mission, whether or not she chooses to accept it, is to marry an alien and save the world, in order to save her family. Darius is charged with delivering his brother's bride home to Centauri, ready to be queen. Falling in love isn't just forbidden, it's a death sentence for him and for his world.