Annie and Caitlin are tormented by repetitive laughter that turns out to be coming from tape recorders hidden all over the power plant. Annie realizes that the caller was just playing with their minds. When Caitlin begs for mercy, the caller gives them more time to get the money together. Annie and Caitlin resolve to get the money as soon as they could and they leave. We see the face of their tormentor. It's Gregory. (thetvdb.com)