Candor, by Pam Bachorz

Everything is perfect in the planned community of Candor, Florida. People are happy and upbeat, children are obedient and clean cut - and subliminal messages are beamed to the residents 24/7 to keep residents brainwashed and under mind control.

Oscar Banks is the son of the town's founder(and the head brainwasher), and his model student perfection is a calculated act. He's the only teen in town who knows about the messages, and Oscar fights the messages with his own counterprogramming. For a price, he will help the troubled teens whose parents have moved them to town escape brainwashing long enough to get out of Candor. It's a risky game, and sooner or later there is bound to be trouble. Trouble arrives in the person of Nia. When Nia moves to town, Oscar is attracted to her intelligence and attitude. And Nia sees right through Oscar's good-boy image. But if he helps her escape, he'll lose her forever; and if he lets her stay she will be brainwashed into a "perfect child", and he'll lose what he loves about her forever too.

The author wrote this while living in a "model" Florida town - it's creepy and suspenseful and keeps the reader guessing as Oscar and Nia get further and further into trouble.