He is Chen Zhao, a once-in-a-century "gentleman thief" who stole the world's rarest treasures for three years, only to fall from grace over a single painting and end up behind bars.
He is Gu Bei, Jinghai's top inspector, who pursued Chen Zhao for three years, only to offer him an agreement after his escape: a chance at survival in exchange for serving as a "special consultant."
A bizarre bank bombing forces these sworn enemies to work together. Chen Zhao puts on a tracking anklet, while Gu Bei stakes his career. They go from uncovering a forged major case to chasing an international conspiracy, from investigating stolen cultural relics to probing the resurgence of strange beasts. Yet behind the truth lies the obsession Chen Zhao has kept buried for seven years: his girlfriend Zhao Jingqi's disappearance was no simple betrayal.
As "special" powers seep into reality and strange-beast worshippers stir up trouble in Jinghai, the line between thief and police officer grows increasingly blurred.
Chen Zhao wields the Sword of the Hidden Abyss to cleave through darkness, while Gu Bei uses his mighty fists to suppress evil spirits.
And those words, "Pleasure doing business," will ultimately unveil a plot within a plot spanning light-years:
"You want the truth. I want her safe. Do you dare take this deal?"