In order to help her impoverished sister, Dr. Caroline Soames-Watkins agrees to help on a mysterious project aiming to go beyond curing the human body of disease to develop a technology capable of solving the riddle of mortality of the soul.

Cass's mom is kidnapped by the evil dessert chef, Señor Hugo, who requests the legendary tuning fork as ransom, leading Cass and Max-Ernest to try finding the magical instrument in time.

Cast out of Eden and separated from the boy she dared to love, Allie will follow the call of blood to save her creator, Kanin, from the psychotic vampire Sarren. But when the trail leads to Allie's birthplace in New Covington, what Allie finds there will change the world forever--and possibly end human and vampire existence.