Listen to our exclusive interview with author Mara Hvistendahl here. “No. No. No.” Mo Yun was flustered. The slim, 40-year-old Chinese citizen had just vacationed in California with her kids, where she had made good on a promise — a trip to Disneyland. Now they were at their departure gate at Los Angeles International Airport, preparing to return to Beijing, when agents approached and announced that they had a warrant for her arrest. They explained that she would need to be separa