经营小型成衣作坊的郑紫怡（李心洁 饰）一段时间以来备受奇怪梦境的困扰，她经常会梦到一片荒郊野地，梦中她直觉感到地下埋着尸体；此外还会梦见一部破损的红电话和登门调查的女警。紫怡四处寻找解决的办法，可是情况非但没有好转，反而愈演愈烈。前夫阿明（黄德斌 饰）的失踪，更让她怀疑自己在梦游时成为了凶手。另一方面，名叫碧淇（杨采妮 饰）的女子其儿子遭到绑架，虽支付赎金仍下落不明。她身为警察的表妹（霍思燕 饰）负责调查此事，却始终未有进展。阿明失踪的事件，将紫怡和女警联系在一起。 　　她们的相遇揭开了紫怡充满悲伤与黑暗的往事，也将这一连串的失踪案件引向未知的方向……Yi has never imagined a revolving dream haunting her every night would evolve into to a nightmare in real life. Shortly after a dream man enters her gloomy life, Yi is set back again by a past broken relationship and becomes a suspected murderer of her ex-husband. The clearer her dream develops, the more real the accused crime appears to her.