Once & Future, book 1

A modern take on the classic Arthurian legend

Ari Helix has been an illegal immigrant in the galaxies for as long as she can remember. But when her spaceship crashes on Old Earth and she pulls a magic sword from an ancient willow, her destiny becomes set in stone. As the forty-second reincarnation of King Arthur she must save humanity from tearing itself apart, with only the help of an adolescent wizard named Merlin.

This female king must battle for her right to be herself, take down totalitarian governments and unite the world. How hard could that be?