In Stephenville, TX, in 1987, Susan Woods doesn't show up for work for 2 days; she is discovered by her father dead at home in her bathtub. As police search for answers, they find a trail of victims - men associated with Susan, including her estranged husband living in Indianapolis. But the case wasn't solved for almost 2 decades.

Firefighters make a grisly discovery of the body of 39-year-old wife and mother Carmella Knight after responding to a house fire outside Toronto. An elaborate undercover sting reveals a devious murder-for-hire plot.

Detectives in Washington, D.C., discover a puzzling connection between two women who disappeared two decades apart. An investigation reveals a sinister secret hidden along one of the busiest stretches of interstate in the country.

27-year-old Egypt Covington is found murdered in her home. Investigators in Michigan quickly identify a person of interest, but years pass without an arrest.

After Florida teacher Denise Hallowell is found murdered in her home, investigators examine her family's tumultuous past in their desperate search for a killer.