A doctor asks Valerie to be screened to be a bone-marrow donor for an ailing leukemia patient. Valerie is delighted with the idea, but she soon reneges with she finds out that the patient sexually abused his teenage daughter. Meanwhile, Donna becomes jealous and suspicious when an old girlfriend of Noah's, Gwyneth, shows up for a visit. David lets his paranoia go too far when he gets mugged. He tries to buy a gun, and eventually steals Noah's gun, accidentally wounding Gwyneth. Kelly continues to be suspicious of Brandon until he offers her an engagement ring. Also, Steve, Brandon and Janet screen applicants for a new assistant for their newspaper. When a young college grad student, Sarah, responds to the call, Steve is wary of hiring her, anxious that he will fall in love with her.