Private agency owner YIP KWOK-CHEONG (Shek Sau) was a former cop. His three investigators are vastly different in terms of personality
. CHOW KA-SING (Wong Ho Yin) is a style freak, WONG SIU-FU (Lee Sze Chit) is a slicker, and KAY ON-KUI (Wong He) is a dependable guy. CHEONG thinks very highly of KUI, who with a meticulous, analytical mind is able to crack the most difficult cases. KUI gets to know model CHUNG YEE-TAK (Linda Chung) when he is investigating an adultery case. TAK comes from a single family. She is always down on her luck when it comes to men and career development. After a near-fatal drunk driving accident, the idea of looking for her mother who left the family many years ago occurs to her. She turns to KUI for help. A subtle chemistry sparks between them during the investigation process. Later, KUI discovers a secret that even TAK never knew…
前警员叶国昌（石修饰演）开办私家侦探社，他属下的探员来自五湖四海，各式其色，如姿整周家昇（黄浩然饰演）、古惑王小虎（李思捷饰演）和大佬纪安居（王 喜饰演），其中安居最受国昌赏识，他缜密的思路、锐利的透析力、总能破解棘手的奇案。安居因调查一宗通姦案，认识了模特儿钟意得（钟嘉欣饰演），但意得生 于破碎家庭，感情及工作上不断受挫。一次醉驾意外，经历生死，令意得萌起寻回离家出走母亲的念头，遂找了安居帮忙。安居在调查的过程中，与意得建立了一份 微妙的关系，及后更发现了一个连意得自己也不知道的秘密……
