Brussels. Leo, a Spanish metro driver, while conducting his train and arriving at a station, sees a young man in distress on the edge of the platform. He recognizes his son Hugo right before he falls ...

新一季会设定上一季大结局的近一年之后，Kim如今为一个人权组织工作，而Bob仍是警察一位。他们追踪一场开始于叙利亚的非法武器交易将他们引到了比利时，Bob随之再次卧底以查明真相。与此同时，首季的毒枭如今身处监狱，但他仍会试图查明让其落网的卧底警察的真实身份。...