Hardhearted and smart Mo Ching became crippled when he was young. Fortunately Ching has met Chu Kot Ching Ngo, the Head of the Sheriff Bureau, and has learned from him his unparalleled skills of using concealed weapons. In addition to Ching, Chu has recruited Zeoi Ming, a cunning swindler, Tit Sau, an honest guy and the cold-blooded Lang Huyt, and called them The Four. The Sheriff Bureau has cracked many difficult cases under the leadership of Chu. Then, Chu falls in love with Song Chi Yin, a herb doctor, but she is only using him to sow dissension amongst The Four. The King of Qi Chiu Cheong and the treacherous minister Choi King are plotting to revolt against the Sung Dynasty. Chu risks his life to ruin their plan, but by doing this he is also driving the bond between him and The Four to the verge of disintegration...