The chilling FINALE of the Replica series!

Something is happening to Amy. It begins with the fading of the crescent moon mark on her shoulder. And as reports trickle in from sister clones who are encountering their share of sudden physical problems, Amy realizes that none of this bodes well.
How can the Amys be developing genetic abnormalities? How can they be losing their extraordinary powers? How can the deterioration be stopped? Amy is stumped by the questions racing through her head. For so long, she has wanted to be "normal"-but that was before she risked losing everything that makes her special. . .