Twinmaker

M. T. Anderson meets Cory Doctorow in this teen debut from #1 New York Times bestseller Sean Williams, who also coauthors the Troubletwisters series with Garth Nix.

When a coded note promises improvement—the chance to change your body any way you want, making it stronger, taller, more beautiful—Clair thinks it''s too good to be true, but her best friend, Libby, falls into a deadly trap.

With the hel...