About to turn 50, a librarian's world is shattered when she learns that her 70-year-old father may have gotten their maid pregnant.

ICAC principal investigator William Luk takes his job seriously, and he needs every last scintilla of support from his team to take on the powerful and cunning Supt Wong, who is corrupt to the core. Wong is an enthusiastic tool of the monstrous Malcolm Wu, a cowboy big-time share trader who will stop at nothing to secure a large slice of the upcoming float of the HK government pension fund, worth billions.

An accident causes a wealthy man to swap souls with a poor woman.