改编自德国畅销小说。一名年轻女子克拉拉，因为男友过世无法走出伤痛，于是一直传简讯给他，未料男友的手机号码，已被一名体育记者马克在使用。两人就在阴错阳差的世界裡，开始产生了交会…。An unstable private investigator suddenly awakens on a subway train to find himself plunging deeper and deeper into a nightmare... that may very well be of his own making.。