Law & Order: Special Victims Unit (1999)

S4E15 Pandora

The horrific rape and murder of a woman driving alone reveals she was an undercover FBI informant working as a cyber vigilante to catch online predators involved in child exploitation. Detectives soon discover her husband has also been killed, prompting them to investigate her most recent target. Their inquiry leads them to an extensive international network of teenage prostitution linked to the Czech Republic, unraveling a complex web of crime that spans borders.