Thiefhunting, Day One. Fully half the day is spent rigging hidden cameras. I’m wearing a button camera attached to an awful button-down shirt that I force myself to wear for the cause. The camera is wired to a control pack and monitor tucked into the back of my skirt. Another wire runs into the shirt pocket where a tiny mic is attached. Another wire ends in a remote control that allows me to start and stop the camera.

I’ve got another microphone clipped to my bra—another piece of clothing I wouldn’t have worn but for the need to keep lifting my shirt for the crew rigging me. This mic is wired to another box that is tucked beside the first one on my back. This pack is a transmitter, and gets very hot. My skirt is tight now with all the equipment loaded under it, and I feel like a third-world building, draped in external wiring.

I’m carrying a purse—a little clutch bag—which contains another hidden camera. This one is a wide-angle that takes gorgeous, sharp video, especially at close range. Its bulbous lens, like a black marble, has been beautifully disguised by our crack camera pros. I put on my NABI cap (my private joke because NABI is the National Association of Bunco Investigators) add sunglasses, and I’m ready to go out and investigate some bunco.

Bob gets the same kind of button cam and mic set up. In addition, he wears a completely wireless camera built into a pair of sunglasses, that he can casually remove and keep shooting with in his hand or set on a table. Bob will also have a tiny wide-angle handheld video camera like mine. His has been carved into a paperback novel. You can’t see it at all—it’s brilliant. Our director of photography is a master. We’re told his shooting is gorgeous, too, but we haven’t seen it yet.

Fully rigged, we make a plan for our thiefhunting. Bob and I will ride public transportation. Sound and camera crew will be nearby, not too close. Film director, associate producer, and our local “fixer” will all tag along, watching, but keeping their distance. We have a few assistants, too. We’re a big group. It will be difficult to coordinate our movements while acting as strangers to one another.

Part one of this story. — Next installment.

This is Part 5 of THE MAKING OF OUR NATIONAL GEOGRAPHIC DOCUMENTARY, PICKPOCKET KING. The film is about us, Bob Arno and Bambi Vincent. We are “thiefhunters in paradise.” The paradise we chose for the story is the warm and wild city of Naples, Italy, home to the world’s best pickpockets. The documentary premieres December 2 at 8pm ET/PT on the National Geographic Channel.

—Originally posted 9/13/10 and soon thereafter password-protected at the request of the producer.