Hui Chun-sum (played by Ruco Chan) is an elite in the Organised Crime and Triad Bureau, but he aims to join the Special Duties Unit; while Sum Wai-lik (played by Ben Wong) is another elite in the Organised Crime and Triad Bureau.

However, the police force is attacked by terrorists, causing severe casualties. Chun-sam gives up his dream of joining the Special Duties Unit and stays in the Organised Crime and Triad Bureau. Chun-sam and Wai-lik work together to fight battles of wits with criminals to solve complex cases.

许浚森是O记精英干探，勇武能干，深受上司器重及战友欣赏，但他最终梦想却是加入飞虎队。另一名O记精英干探沉韦力，有著精明头脑及丰富经验。二人处事方式虽截然不同，但惺惺相惜，彼此互补不足。不料警队适匪徒埋伏，伤亡惨重，为了找出幕后黑手，森放弃梦想留在O记。 除此之外，森、力二人亦要面对一系列曲折诡秘，刁鑽莫测的逆天奇案！ 二人利用逆向思考、心理博奕、缜密分析，解构罪犯思维动机！ 天网恢恢，绝不遗漏！