Mariana van Zeller has been investigating the underbelly of crime and human desperation for over 15 years. We can understand her curiosity and her drive, but viewers never get to see what it takes to sit across the table from a drug cartel member and talk about how it feels to kill. In her shows, Mariana makes it all seem so easy, so normal. Yet at times she admits to being scared, nervous, sad. In Mariana van Zeller Investigates we go behind the scenes of some of the most intense moments in her trajectory with National Geographic. She tells us what it takes to get the story.