 A fire sweeps through a large home improvement center in South Pasadena, CA, snuffing out the lives of four innocent people, including a two-year-old boy, his grandmother, and two employees. Firefighters rushed to the scene, even as a pair of equally suspicious fires broke out in two nearby stores. Was the fire an accident, or was it arson? It takes a Task Force of arson investigators to answer this question and solve the case.