Melusine Carmichael mistakes the plunge pool at the Aquatic Center for a regular pool and almost drowns with the sudden shock of the icy-cold water. While underwater she hears a voice calling her "Melly," a name she never uses. Yehudi and Arlington are nearby in the sauna and rescue her, using their personal body heat and the sauna to warm her up. They keep in contact with her via Facebook, and finally convince her to let them teach her to swim. But Mel hears the voice again and worries that they're stalking her, so she cuts contact with them. Yehudi and Arlington try everything to see her and she prevents them, so they meet her parents after their swimming class. They learn about the voice saying "Melly" and that someone is stalking her. But who is it? And how can they get Mel to spend time with them again so they can convince her of their innocence?