Scott Rob Scott 
Incognito [EPUB ebook] 

Mandrake King discovers a language being transmitted via text messages among teenagers. With the help of some of the teenagers he interacts with, he gains insight and knowledge and assists them with gaining access to the barter system the language pertains to. While the texting language morphs and sweeps the entire teenage world, simultaneously Native Americans resurrect their ancient language and mobilize their efforts to reclaim Manhattan Island.