Beijing student Lulu Lu was just preparing for bed when she was startled by loud banging at her door. When she opened the door, a man pushed his way inside, shone a flashlight in her face and shouted: “Get down. Give me your phone.” Lu froze. Moments later, she came to her senses and did as she was told, burying her face in the mattress and raising her hands above her head. The intruder blindfolded Lu, tied her hands and finally made her record a phone message for her parents – begging them to...