Evangeline is living the life of a regular teenager, until mysterious, severe symptoms begin appearing. After passing out in the middle of a party, she is diagnosed with a rare, genetic blood disorder that causes her own immune system to attack her red blood cells. In the delirium of her deteriorating health, a door to a parallel world opens before her; however, once she steps through the portal, she is unable to return to her own life.
The place Evangeline now finds herself in is called Terra Nova, a world wherein vampires rule supreme, with no traces of humans left to speak of. Curious but afraid, she quickly learns that Terra Nova is not the shadow-side of Earth, but rather the tragic result of its mistakes. In order to survive, Evangeline must keep her mind open and accept the changes her body is undergoing. Soon enough, those who she initially thinks of as murderers become her trainers, whose help she must enlist if she ever hopes to return home - and soon enough a romantic bond begins to form.
Meanwhile, Evangeline’s brother and friends back on Earth try to figure out what happened to her, who is involved, and how to bring her home. Unbeknownst to any of them is the mysterious outcast Bambi, whose secrecy disguises her power in making a devastating choice: save one world at the risk of destroying the other.