As “Trafficked With Mariana van Zeller ” ended its award-winning run on Nat Geo last September, van Zeller has moved on to a new chapter in her career. The Emmy, Peabody and DuPont Award-winning journalist has launched The Hidden Third , a new independent production company. The news was announced by van Zeller and Muck Media , the L.A.- and Lisbon-based production company founded by filmmakers Darren Foster, Jeff Plunkett, Alex Simmons, Cristina Costantini and van Zeller. ‘The Secret Agent’