In a world where everyone is the same, Trigger 17 convinces Dahlia 16 that she is unique but this proves that both are flawed, which could lead to dire consequences for their entire genomes.
Dahlia thinks all of her clones have been destroyed, but then discovers that one still exists--Waverly Whitmore, who is teenage royalty, a media sensation with millions of fans--who has no idea that she is a clone.