Les habitants d’une tour de cité découvrent un matin qu’un voile noir obstrue toutes les fenêtres et la porte d’entrée de l’immeuble. Un voile noir qui dévore tout ce qui tente de le pénétrer…
Yoo-ra suffers from nightmares every night. One day she meets her high school friends. Jin-tae is a promising artist, In-seok is a chaebol and former thug, Hye-jin likes In-seok, and Seong-ho, who used to be In-seok's errand boy, finally meet up. Yoo-ra asks her friends if they remember the classmate that killed herself. Everyone is flustered and claims they don't. Yoo-ra goes to the bathroom, but passes out after seeing herself in the mirror. Everyone gets in In-seok's car to send Yoo-ra home, but they get into an accident and all become unconscious. When they wake up, they are at a familiar school that's closed. It was the school they went to that has closed down. Why did they end up there? Yoo-ra and her friends tremble in fear for their lives...
故事发生在1884年的英国，伊诺拉（米莉·博比·布朗 Millie Bobby Brown 饰）正准备迎接自己的16岁生日，哪知道在这一天，她的母亲（海伦娜·伯翰·卡特 Helena Bonham Carter 饰）失踪了。大名鼎鼎的名侦探夏洛特福尔摩斯（亨利·卡维尔 Henry Cavill 饰）和麦考夫（山姆·克拉弗林 Sam Claflin 饰）成为了伊诺拉的监护人。 面对古灵精怪不受控制的妹妹，两个男人一门心思的想要将她送到专门培养“淑女”的寄宿学校中就读，伊诺拉哪会这样乖乖受人摆布？一言不合之下，她选择了离家出走，只身一人前往伦敦寻找母亲的下落。在旅途中，伊诺拉被卷入了一个非常神秘的案件之中，她化身成为侦探，和自己的哥哥展开了斗智斗勇的较量。
