A government organization has been set up to do genetic research on humans resulting in people with two sets of DNA in one body. The idea is for these people to be the ultimate spy but agendas change and they are trained to become the ultimate assassin. There are triggers that can cause a person to pretty much instantly and physically change into her other half and one half may not know the other exists. Gwen is one such person, genetically engineered, cloned from the researcher's dead daughter, living the life of a socialite, unaware that Mary the assassin resides within her.
This story had much promise but fell flat for me. I wanted more back story, more filler about the people in it, more information about the technology. Instead it was like a fast paced action flick with lots of jumping around from scene to scene but not many answers. It was also quite dark with not much light to alleviate it (within the story and illustrations). Maybe more background will be given in later volumes but I probably won't read them.