Sarah ran, weaving through the crowd, disappearing into the sea of people. She found herself surrounded by beggars sitting along the street. Her pulse hammered in her chest as she spotted an addict passed out on the sidewalk. Without thinking, she snatched a scarf from him and wrapped it around her neck, trying to hide her frantic movements.

She kept running, trying to lose him. She stumbled into a grim area, the stench of drugs hanging thick in the air. The abandoned warehouse ahead was ...