A dark web agent, Greg Squire, was investigating a case of a 12-year-old girl, named Lucy, who was being abused and her images were being shared on the dark web. The agent and his team were able to track down the abuser by analyzing small details in the images, including a specific type of brick in Lucy's bedroom. The brick expert, John Harp, helped the team narrow down the location by identifying the brick as a 'Flaming Alamo' and providing information about its distribution. The abuser was eventually arrested and sentenced to over 70 years in jail.