
This episode covers the Seattle arson case, the assassination of Senator Huey Long, and the story of Mary Jane, a girl searching for her brother.
The Seattle arson case discusses a massive fire at the Blackstock lumber warehouse in September 1989, which resulted in the deaths of two firefighters. Investigators believe the fire was set by a highly skilled arsonist known for using an unknown accelerant that generated extreme heat, making it difficult to extinguish the flames. Eyewitness accounts describe suspicious individuals seen near the fire.
The episode then shifts to the assassination of Senator Huey Long in 1935. Long was a powerful political figure whose controversial policies made him many enemies. After being shot, he died from complications during surgery, and the episode questions whether his death was due to an assassin or an accidental shooting by his own bodyguards. New evidence suggests a cover-up surrounding his murder.
Finally, the episode tells the story of Mary Jane, a girl who was found abandoned and beaten in 1947. Now a successful businesswoman, she is on a quest to find her long-lost brother, whom she met only once. The episode follows her emotional journey as she reconnects with her siblings after decades apart.
Viewers are encouraged to help solve these mysteries as the stories unfold.
This episode features a Seattle arson case, Huey Long's assassination, and Mary Jane's search for her brother.

This episode stands out for the following:
It was like being x-rated with heat.Unsolved Mysteries with Robert Stack - Season 5, Episode 3 - Full Episode
A force of nature like the senator had been forever silenced.Unsolved Mysteries with Robert Stack - Season 5, Episode 3 - Full Episode
I would say categorically no, he didn’t.Unsolved Mysteries with Robert Stack - Season 5, Episode 3 - Full Episode