Janus is a Two-Faced Moon — Susanne Marie Knight

In the year 2458, injured ballerina Blade Sinclair is offered the chance of a lifetime to dance again. She agrees to participate in the Galactic Olympic Games. The event: air ballet to be held on Earth's moon. The catch: instead of being an athlete for Team Earth, she would compete for Team Sarthox. The additional catch: not only is the Sarthox an alien race, they have a hidden agenda. If Blade doesn't win a gold medal, her family will die. If Blade does win, then the Sarthox will destroy Earth and take over the solar system in an age-old retribution against their enemies, the benevolent race called the Ancients. What's a girl to do? Christopher Bainbridge has had his share of traitorous females. As the Galactic Core Coalitions security chief for the Lunar Olympic Games, he finds himself mixed up with another one: a woman who competes against her own kind for an alien race. But Blade doesn't seem like a typical traitor, and against his own inclinations, he falls in love with her. How can he help her escape from the Sarthox and save the solar system at the same time?