Inspired by a news story the director Pang Ho-cheung noticed while still a high school student, The Exodus tells the darkly comic tale of a world in which the female population are slowly, and methodically doing away with their male counterparts. Sergeant Jim Yip (Simon Yam) is constantly being harped on by his mother in law for not being more successful and wealthy, and largely ignored by his uncaring wife. Likewise, he is largely seen as an outcast by his colleagues on the force, and doesn't have any real friends to speak of. When Sergeant Yip is called on to take over the interrogation of Kwan (Nick Cheung), a man found spying on females in a public restroom, it initially seems like a typical peeping tom case. When Kwan reveals that he was actually attempting to gather evidence about a clandestine group of women plotting to wrestle control of society away from men, the detectives in charge of the case dismiss him as mentally unbalanced. But later, when Kwan alters his deposition, Sergeant Yip believes there may be more to the case than meets the eye and quickly sets out to investigate. What he discovers proves a terrifying new take on the term "battle of the sexes."