Kelly and Steve investigate the tragic homicides of a pregnant mother and her two-year-old son who died in an apartment fire while her husband escaped; an arson specialist is called in to help make sense of the clues and catch the killer.

Kelly and Tonya delve into the grisly multiple murders of a young mother, grandmother, toddler, and newborn baby; forensic handwriting analysis could help identify the killer and author of a frightening message written on the wall.