交换：你兄弟

　　When an alien hunter arrives on post-apocalypse Earth, it takes down a gang of warlords and unexpectedly becomes a folk hero to the oppressed locals. Now with their support, the alien sets its sights on the warlords' ruthless leader.

省公安厅夏丹调查表弟吸毒致死案，发现背后涉及跨境贩毒集团。她与香港警察卡龙合作卧底，接触头目冷月及其上级李绍远。警方通过技术手段锁定国际毒贩托妮，为取得对方信任，夏丹不得不当着毒贩们的面当场将卡龙击毙……

　　In the suburbs of Rome two very different souls intersect. One is the son of a restaurant owner who disappeared with his lover. The other is a young mysterious woman who has arrived from China in search of her missing sister.

 翠岛市发生了一起珠宝抢劫案，店内的金银首饰被洗劫一空，唯一的目击证人亦在家中被人杀死。省公安厅的侦察员方中剑在案件中失去了记忆，遭到了警方的通缉，在金铺饭店内，歹徒出动想要杀人灭口。林娜是方中剑的女友，同时亦是一名警察，坚信男友无辜的她在暗中给方中剑提供了许多的帮助和保护，然而，在解救人质的行动中，林娜不幸中弹，死在了方中剑的怀中。悲伤和愤怒的冲击下，方中剑找回了失去的记忆，他只身一人闯入了劫匪的老巢，发誓要给女友报仇。当他击毙了劫匪首领梅山后才发现，这整个事件并没有表面看起来的那么简单。