Marshmallows Are Their Favorite: Undercover at a Primate Lab

One investigator. Four months undercover. Getting in was the easy part.

Trusted with the keys and armed with covert cameras, she steps into a world the public was never meant to see. Thousands of monkeys in metal cages. Secrets hidden in plain sight.

She tries to make sense of what's being done to the monkeys while everyone around her acts like it's just another Tuesday.

No one suspects her. One mistake could change that.

Day by day, the pressure of her double life builds. Close calls mount. ...