For six months the girl kept on running and during this time she got her training too. Finally in the last part of the series we observe that Sienna is ready for her first mission and she can take care of things on her own. Robert J. Crane started the series when the girl was unaware of her powers.
After every episode, Sienna became more and more powerful and finally, she made her enemies run. Defender and Omega are single books and getting the box set is always a better thing. Annie Sullivan has narrated all three parts of the series so her voice is the only voice that you will hear. Moreover, there is no change in the theme or mission of the characters so a single focused heroine is witnessed in the story.