The Good Girl by Mary Kubica

Born to a prominent Chicago judge and his stifled socialite wife, Mia Dennett moves against the grain as a young inner-city art teacher. One night, Mia enters a bar to meet her on-again, off-again boyfriend. When he doesn’t show, she unwisely leaves with an enigmatic stranger. With his smooth moves and modest wit, at first Colin Thatcher seems like a safe one-night stand. But following Colin home will turn out to be the worst mistake of Mia’s life.