故事发生在上世纪初的香港，小喇叭（张卫健 饰）是一位正义感极强的青年，自愿加入水警队，为国家效力。一次偶然中，贺定国（谭耀文 饰）抓住了猖獗的海盗头子古豹，因此而成为了陆警总司令，他和小喇叭在一次行动中不打不相识，最终成为了肝胆相照的挚友。
　　古莉（张龄心 饰）和古慈（刘园园 饰）是古豹的两个女儿，古豹不甘心就此销声匿迹，遂派她们潜伏在贺定国的身边，伺机将其暗杀，古莉来到了贺定国的家中做女佣，而古慈则加入了水警，就此与小喇叭相识。随着时间的推移，古慈渐渐喜欢上了善良开朗的小喇叭，而古莉亦被贺定国的正直和执着所吸引，刺杀行动眼看就要泡汤。

　　意大利电视连续剧《出生入死》之第6部。
　　In Episode 1, The Killing Attempt, police detective Davide Licata survives badly wounded, so much so that his personal and love life will be affected. In Episode 2, The Core, he is tempted by the General directing the Government's "nucleous of operations and investigations (NOI)", a secret service built to do the dirty anti-crime jobs that the police can't do. In Episode 3, The Man of the Letters, exposes the hideout of Tani Cariddi in deep Africa - and again, the retired detective and the retired criminal must come to grips with violent action in Europe. In Episode 4, The Trap, not one but several traps are set from both sides of the law. In Episode 5, Codename: West, a desperate chase is given by The Core and two countries magistrates to catch the new drug lords that are aiming at deluging drugs into Europe's Eastern countries from a former Nazi concentration camp in the West. In Episode 6, A Secret Is Revealed, the detective exposes and destroys the man who secretively had taken the place of octopus' head - but crime will not stop because the criminal's son escapes with enough power to restart it all.