Sixteen years ago in a gray Chinese city, a sanitation worker made a disturbing discovery. She was unlucky enough to find a body-an unrecognizable mass stuffed into a zippered bag. For years, the murder remained unsolved, and the police figured it was an isolated crime in their otherwise safe community. But now that another body has turned up in the same place and in the same horrific condition, they know it’s time to bring in an expert. The police, desperate for answers, call Han Yin, a handsome thirty-year-old criminal profiler. Renowned for his ability to interpret microexpressions and see through lies, he is the perfect man to investigate the list of seedy suspects. Along with the help of an aloof but sharp forensic pathologist and the beautiful chief of criminal investigation, Han Yin must navigate the city’s dark alleys and darker secrets. As a new wave of violence hits, will he be able to determine which crimes are false leads, and which ones might be linked to the brutal killer?