Mr. Wu, a Hong Kong movie star, is kidnapped in Beijing by Zhang Hua's gang. The police quickly form a task force and begin the search, ignoring that detectives in charge have only twenty hours before the deadline.

The film spans two decades, as the story unfolds in a series of flashbacks that begin when Qiyue and Ansheng were just thirteen. The two became inseparable, until they met a boy who ended up tearing their lives apart.

Tang Yijie, the Construction Committee Director, falls off from rooftop and dies in a demolition riot. Yang Jiadong, a young police officer starts his investigation and finds that Tang's death is tied up with another case several years ago. Soon he is framed and suspended from duty, but he never gives up.

上海女学生葛薇龙（马思纯 饰）求学香港，投靠姑母梁太太（俞飞鸿 饰），被梁太太利用，当作诱饵来吸引男人，葛薇龙渐渐沉迷在纸醉金迷中，后来被花花公子乔琪乔（彭于晏 饰）吸引，为了继续过声色犬马的上流社会生活，不惜出卖自己的灵魂，费尽心机嫁给了乔琪乔，最终沦为姑母梁太太和乔琪乔敛财的工具。