Madison Mackenzie Rhodes has a comfortable life with a daily routine. When her life is disrupted by an unexpected stranger, she learns there is nothing typical. Her entire world is turned upside down when she finds out that she is a clone, created to hide the secret that we are not alone in this galaxy. Her counterpart, going by the nickname Mack, works for the Intergalactic Security Commission, which works with a coalition of other planets that protect each other and create technology. As if that wasn't enough, she can't stop thinking about John Brooks, one of Mack's teammates. When an enemy rises from within the ISC that targets both Maddie and Mack, they must work together to save their lives as well as the planet.

With everything changing, and now with her heart involved, saving the world might be the easiest part of it all.