本片根据真实事件改编，取材自一起三十年未能侦破的刑事案件，讲述了一个哥哥在不断寻找失踪妹妹的过程中希望逐步褪变成绝望的故事。1989年夏天，汉堡高级警官托马斯·贝特格的妹妹芭芭拉·内德尔从位于死刑犯林中的死亡森林（Dark Woods）逃脱。自那之后，哥哥托马斯一直试图找到她的下落，但是到现在已有三十年。为了找出 sisters disappearance and her current whereabouts, brothers Thomas Bettker is a police officer in Hamburg to the Dark Woods into an investigation. The search for missing sister turns into a desperate pursuit of brother gradually transforming from hopelessness absolute. 1989年夏天，汉堡高级警官托马斯·贝特格的妹妹芭芭拉·内德尔从位于死亡森林（Dark Woods）逃脱。自那之后，哥哥托马斯一直试图找到她的下落，但是到现在已有三十年。为了找出 sisters disappearance and her current whereabouts, brothers Thomas Bettker is a police officer in Hamburg to the Dark Woods into an investigation. The search for missing sister turns into a desperate pursuit of brother gradually transforming from hopelessness absolute. 1989年夏天，汉堡高级警官托马斯·贝特格的妹妹芭芭拉·内德尔从位于死刑犯林中的死亡森林（Dark Woods）逃脱。自那之后，哥哥托马斯一直试图找到她的下落，但是到现在已有三十年。为了找出 sisters disappearance and her current whereabouts, brothers Thomas Bettker is a police officer in Hamburg to the Dark Woods into an investigation. The search for missing sister turns into a desperate pursuit of brother gradually transforming from hopelessness absolute. 1989年夏天，汉堡高级警官托马斯·贝特格的妹妹芭芭拉·内德尔从位于死刑犯林中的死亡森林（Dark Woods）逃脱。自那之后，哥哥托马斯一直试图找到她的下落，但是到现在已有三十年。为了找出 sisters disappearance and her current whereabouts, brothers Thomas Bettker is a police officer in Hamburg to the Dark Woods into an investigation. The search for missing sister turns into a desperate pursuit of brother gradually transforming from hopelessness absolute.