导演黎妙雪180度大变，由拍问题少女到痴恋少女后，转向惊悚血腥之作。一间于大澳的度假屋，住了不少年青人，当中有小说家、悠手好闲的小混混等等。一日一男子从九龙到了那儿度假，及后发生多多怪事……

An ex-cop searches for a missing teen as a favour to her parents.

When Rain, a beautiful university year 4 student receives an SMS on her mobile phone - "Do you know what the 19th Gate of hell is?", the nightmare begins for her. It is not too long before she realizes that she is unwittingly trapped in a terrifying mobile phone game from hell and this game is larger than life.

One suspects writer-director Carol Lai may have harboured some Black Swan ambitions with a tale that also centers around a stage practitioner who embarks on an unwitting destructive journey when playing a role to die for. The Second Woman, whose Chinese title Romance Riddle may hold better clues as to how this film developed, being more of a guessing game that threw constant clues rather than a overly romantic film about twins falling in love with a man who decided it's perfectly OK to string both women along, until he discovers that this spells double trouble.

曼儿（林嘉欣 饰）为了寻找男友德森（郑伊健 饰）生前的一幅画来到了青岛。男友因为遗传性的疾病而离开了她，曼儿一直想找到这个画中的景象。青岛是德森小时候生活的地方，她想在这里能找到线索。 来到青岛后的她认识了乐于助人的邮差小烈（刘烨 饰），小烈更乐于帮助曼儿寻找画中景象。但没想到的是小烈与曼儿之间的感情发生了微妙的变化，使曼儿不知所措，百般滋味在心头……