A Chinese man hired a Florida surrogate, then didn’t pick up his kids because of visas issues, sparking a custody battle that could upend the lucrative, largely unregulated industry. Emi Nietfeld spent more than a year reporting this rollercoaster of a feature. One particularly harrowing turn involves the father hiring people to retrieve the babies for him:

As the men continued knocking on her door, Simpson’s phone convulsed with notifications. Zhou messaged her nonstop. He called 53 times. “If you don’t give my babies to us, we have to report to the police. And you will be arrested immediately,” he warned. Then came pleas—or were they threats? “Think about your daughter,” he wrote, referring to Simpson’s 5-year-old. “I don’t think you want to have her be live without you for several years!”

Halfway across the world, Zhou paced in his apartment, chest seizing in panic. Over and over, he’d tried to explain his predicament to Simpson. He was still waiting for his visa interview; without her help, he couldn’t get his kids home. Running out of money and options, he’d hired the handlers as a last resort. Now, as his calls and messages went ignored, he feared she’d fallen in love with his children and would never let them go.