San Francisco is held in thrall by a professional arsonist who burns down businesses for insurance purposes. Detectives Stone (Karl Malden) and Keller (Michael Douglas) enter the story when one of the arsonist's assignments results in the deaths of two firefighters. A number of Streets of San Francisco "repeat offenders" make guest appearances in this episode, including Barry Sullivan and Kaz Garas. ~ Hal Erickson, Rovi