Impostors (YA)

Identical twins, the older to be the revered and in the public's eye,  the younger the body double and there to take a bullet if needed or to be a  hostage.  But does training ever cover all contingences?
Imposters is set in the same world as the Uglies, Pretties, Specials books but in their future.  Tally's name is remembered on walls hoping she will come back and save them.  Only Scott Westerfeld can weave a story that has action, suspense, and can intertwine the two girls lives the way they are in this book and have it all come out making sense in the end. This book has so many different elements incorporated into it, it is just such a awesome book.