Originally living a happy and stable life, things have become clouded for rich heiress Ye Shuang (Qin Lan) after the unexpected disappearance of her husband Ling Feng (Archie Kao) and daughter. After consulting with her father Ye Cheng (Simon Yam), Shuang decides to call the police, where she re-encounters her ex-boyfriend, Yao Jie (Gordon Lam). During the investigation process, Jie finds this million-dollar ransom kidnapping case to be a misty mystery. Specializing in investigating by starting from minor details, he targets Cheng as a potential suspect. At this time, Cheng's activities has also become suspiciously strange. When the mystery seemed to have dispersed, Cheng dies from an accident. At this time, clues from a murder case that took place 20 years ago begins to surface. Behind those clues, the mysteriously kidnappers actually have an ulterior motive. 《别有动机》-----看烂片也是一种生活方式。有多少人注意到了“香烟”这个细节。这个悬疑剧不是在讨论爱情这件事吗？怎么都没人说？。动机还是机动，深深的无力感。为什么我感觉在是看狄仁杰？元芳，你怎么看。导演你该多花些心思。给一星的全是水军吧，你们这么恶搞别人的电影，你觉得好吗。故事的确够复杂，张力不够。。《别有动机》：罪案真相不只有一个。六毛特效良心画面 带我怀缅电影情怀。 叶霜（秦岚 饰）是含着金汤匙出生的富家千金大小姐，从小过着养尊处优的富裕生活。长大后，叶霜和丈夫凌锋（高圣远 饰）结婚，婚后两人十分恩爱。没多久，叶霜就怀孕了，顺利诞下了可爱的小女儿，一家三口的生活幸福美满堪称典范。然而，在忽然之间，这美好的一切都消失了，丈夫和女儿的无故失踪以及绑匪索要的巨额赎金让叶霜陷入了绝望之中。 叶霜向警方求助，却因此意外的遇见了前男友姚杰（林家栋 饰），姚杰通过重重的调查发现这起案件背后十分蹊跷，而千丝万缕的线索都指向了叶霜的父亲叶城（任达华 饰）。然而，就在这个节骨眼上，叶城亦遭遇意外死亡，一下子，所有的线索都断了链，案件再度陷入了扑朔迷离之中。
