Taboo by Kimberly Burke

Hamilton High is just like your high school, only stranger. Syl and Jenny, the new kids on campus, quickly discover it's a place fraught with unspoken rules -- words you can't say, colors you can't wear, places you can't go -- and a powerful student group called the Security Committee that enforces them. But operating just under the radar of the Committee is the Taboo Society, a covert group that questions their unmitigated power. When Syl and Jenny come into conflict with the Security Committee, they must decide where their loyalties lie in this engrossing drama.