The League of Freaks and the Secret Key    by Alberto Hazan
You set the price! 79390 words. Published on October 27, 2010. .
Strange things keep happening to Shree Mandvi, an ordinary Indian girl from the Bronx, when she moves to a private school in Cambridge. If having the ability to fly wasn't weird enough, Shree discovers four other freaks at her new school with similar powers. Together, they chase after a hidden treasure (and a mysterious secret key) that's been lost for centuries somewhere under the Harvard campus.

The Secret of Invisibility Revealed    by Novel Discoveries
Price: $14.99 USD. 8920 words. Published on February 8, 2011. .
The ancient art of vanishing from sight and reappearing at will. As seen on Jay Leno: Become Invisible and walk unseen among people or crowds. Total invisibility... not even a shadow. Works even when surrounded by cameras or people. Really works! This is not a play on words or some act of camouflage/ninja/psychology. Be invisible! The Secret of Invisibility Revealed