The unsub is obsessed with the number three, believing it has divine significance.
The investigation leads to , a chemistry student who survived a traumatic house fire as a child. She believes she is testing her victims' purity through fire. CompulsionCriminal Minds : Season 1 Episode 2
Clara traps three classmates in a science building elevator on the third floor, dousing them with chemicals and preparing to set them ablaze. The unsub is obsessed with the number three,
The team struggles because the perpetrator doesn't fit the standard profile of a male arsonist motivated by power or revenge. Dr. Spencer Reid eventually identifies the motive as —a form of Obsessive-Compulsive Disorder (OCD) involving religious or moral obsession. Clara traps three classmates in a science building
The team originally misinterprets a distorted tip-line message as "I do this for Karen," but later realizes she is saying "Charon"—the ferryman of the dead in Greek mythology. The Unsub: Clara Hayes