Margaret Campbell, a Chicago forensic pathologist, has been invited by the Chinese government to teach at the Beijing police university. She has accepted the six-week assignment with misgivings but is desperate to escape a troubled life in America. Arriving in Beijing, she checks nothing to declare on the health declaration they gave her on the plane---nothing, that is, except a broken heart and a wasted life, neither of which was contagious. She gets off to a bad start when her car knocks senior detective Li Yan off his bicycle. In a furious clash, he dresses her down in perfect English. But Li soon finds himself reintroduced to Margaret by his superiors when the newly promoted detective's first case requires Margaret's special expertise to identify a horribly burned corpse. Thrown together to track down the killer, Margaret and Li must bury their personal and cultural differences when they uncover a conspiracy that threatens not only their lives, but the lives of millions.