Monica becomes a substitute teacher for a class ""resource students."" Their learning disabilities and health problems have aggravated a number or subs and none of the temporary teachers have stuck around. One student especially needs her help. Her name is Charlee, and she has obsessive compulsive disorder. As a result of her disorder, she is constantly plagued with worry. Before class she checks her locker numerous times to make sure it is locked. Later on, she thinks the air dirty and after a few minutes, she gets so worked up that she has trouble breathing and is sent to the nurse's office. The nurse, Tess, tries comfort her, but Charlee insists on going home, and her father, Rolando, agrees to come get her. However, in order to do that, he must sign a release form though he has trouble locating the signature line. Rolando can't read. With this realization, the angels decide that Charlee is not only the assignment here. They go to visit Rolando that evening, in part to talk