Sarah,* 24, wakes up every morning and immediately taps seven times on the edge of her bed; she’s compelled to perform this ritual like clockwork, out of fear that if she doesn’t, something terrible will happen to her or her family. Seven is Sarah’s safe number; she eats her meals only at 7:00 a.m. or 7:00 p.m., repeats words compulsively under her breath seven times in a row, and on the rare occasions she gets up enough courage to leave her apartment, Sarah paces herself frantically to be sure she takes exactly 77 steps to reach the corner store. Sarah also lives in fear that she has contracted AIDS and can spread it to others, even though she’s never been sexually active.
