Compulsioncriminal Minds : Season 1 Episode 2 -

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.

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 CompulsionCriminal Minds : Season 1 Episode 2

The unsub is obsessed with the number three, believing it has divine significance. The investigation leads to , a chemistry student

Fires are set in patterns of three (e.g., the first on March 3rd at 3:00 PM), and the unsub performs ritualistic actions in threes, such as turning doorknobs or repeating words. The investigation leads to