At the dance, Pam spots Mark and motions him over. As he walks towards her, Lisa asks him to dance. Mark agrees, which upsets Pam. Mark then walks over to Pam and the two share a brief but tense exchange. A moment later, Lisa walks up and bumps Mark, which causes him to spill his drink on her dress. She returns to the dorm to change and is chased by the same prowler, but escapes. She runs outside into the wheelchair-bound Major Chatham who grabs her arm. Pam escapes his grasp and soon reunites with Mark. She tells him about the prowler so he investigates. After checking the dorm, Mark only finds bootprints and wheelchair tracks outside. The two then go investigate the Major's home. Pam realizes that his daughter was Rosemary and that her killer was never caught. Convinced the prowler from earlier is the same killer, Mark and Pam head back to the dance and warn the chaperone, Allison, about the possible danger.