缉毒民警李涤凡(邢家栋 饰)在侦察一条贩毒线索时惊异地发现,与他相恋多年的女友林明慧(岳跃 饰)竟然牵连其中,令他百思不得其解。这时上级不分原由地将他调离一线缉毒大队,降为普通社区民警,而刚刚被抓的明慧则无罪释放,然后不知所踪。面临生活、爱情及事业的双重受挫,李涤凡陷入不解和迷惘,但很快,职业警察的良好素质让他很快进入了角色,他在干好本质工作的同时还照顾着女友生病的母亲。贩毒大案破获后他才知道,明慧是省厅禁毒处安排在毒枭身边的卧底。后来明慧再次充当内线打入毒贩网络贩毒内部,不幸的是她在一次执行任务时牺牲,李涤凡前赴后继顶了上去......。In the fourth season, a woman is found brutally murdered on a small artificial Danish island close to the Øresund Bridge. The woman is Margrethe Thormod, Thormod, Director General of the Migration Agency in Copenhagen, who was recently embroiled in a deportation scandal. Danish detective Henrik begins to investigate the murder without the involvement of Saga, due to the fact th...。