Both JT and Amy welcome old friends to Shanghai and are reminded of their lives before Flatland. JT's friend lures him into a tomb-raiding scheme, unknowingly awakening an invincible ancient warrior with ties to Khan.

The devil's daughter is alive and in Shanghai, and with her come secrets that threaten the balance of good and evil in the universe. The battle for the girl's soul reignites, in the past and the present.