Watch NOVA Season 23 Episode 6 Online

In the spring of 1991, a rash of suspicious store fires in Los Angeles set fire investigators on the trail of a serial arsonist. Using ingenious techniques to "read" burn patterns and reconstruct the chain of events at each fire, the team uncovered a crucial clue—a fingerprint on a crude incendiary device. Eight months later, the team closed in on their chief suspect and revealed the shocking truth behind his identity. A classic scientific detective story with a final twist that will keep viewers guessing until the end.