Desc: Shuang long tu zhu: Directed by Wing-Cho Yip. With Richard Ng, John Sham, Deannie Ip, May Mei-Mei Lo. Hong Kong detectives Chau and Beethoven are back once more, this time on a mission to protect a young witness from a triad boss, out to eliminate her so she couldn't testify in court against him. Meanwhile, the plot thickens when a police medical report reveals Chau allegedly has terminal cancer; therefore, Beethoven will see to it that his partner has a well-deserved vacation in his remaining months.