Victims' rights activist John Walsh and his son, Callahan, showcase time-sensitive, unsolved cases in desperate need of attention, mobilizing the public to engage in the pursuit of justice.

What happened in the final days of Gabby Petito's life? In this gripping true-crime series, her loved ones reveal the untold story of her tragic murder.

Elizabeth Vargas breaks down some of the toughest cases in the pursuit of justice.

In the picturesque town of Cape Coral, Florida, Cal investigates the disappearance of 29-year-old single mother Lauren Dumolo before heading to Ft. Lauderdale to uncover the truth behind a mysterious case involving a missing teen named Sophie Reeder.

After his wife and eight year old son disappear on a beach and the police find no clues, Antoine starts investigating their disappearance himself. Starting with locals, Antoine immerses himself into their world entering an underground cult that leads him into a remote, abandoned western town in the desert. Now, he must find his family as the cult leader plays a twisted, psychedelic game with him…