"The ultimate cure that could heal any disease? Crazy. That's exactly what research scientist Marian Creighton has always believed about her father's quest, even if it does stem from a desire to save her sister Ellen from the genetic disease that stole their mother from them. But when her father falls into a coma after drinking a vial of holy water believed to contain traces of residue from the Tree of Life, Marian must question all of her assumptions....

"Gabriella and Evangelia Betarrini are just two normal American teenagers. Normal - except for the fact that they time travel to fourteenth-century Italy, where they've lived in castles, become swept up in historic battles, and fallen in love with handsome knights willing to do anything to keep them alive. They've returned with their mother to the present to save their father before his tragic death, and now the family travels back to the place that...