Jonah Mulray is a professor whose world comes crashing down when his wife is killed in a car crash in Hong Kong. Though his wife lived and worked there for six months, Jonah's fear of flying has stopped him from ever visiting. Now forced to abandoned his sheltered life, he must venture across the world to identify her body. However, once he arrives he finds out a shocking truth and is drawn deeper in a web of conspiracy in a foreign and unfamiliar place.
Chan, an articulate senior detective nearing the end of his career, is taking care of the daughter of a witness killed by ruthless crime lord Po. Martial arts expert Ma is set to take over as head of the crime unit, replacing Chan who wants an early retirement.