在第四季的结尾，这团盘踞在寄宿学校的阴影终于揭开了它的神秘面纱，竟然是纳粹余孽！二战硝烟已然散去，他们聚集在此又意欲何为？倒在海岛上的Andrés Novoa（Paula和Marcos的父亲）居然失忆，他该怎样重返故国找回身份。恶贯满盈的Joaquín Fernandez倒在血泊之中，Jacinta与Martín会因此锒铛入狱吗？ Iván终于从Toni口中得知了María是他的生母， 他们会顺理成章母子相认吗？被送往医院救治的Héctor能否平安归来？倒在藏宝室里的Fermín是否安然无恙？距离学期结束仅仅剩下九天时间，但是有Jacques Noiret担任校长，学生们注定将面临前所未有的危机与挑战，他们能否继续勇往直前？El Internado (Spanish, The Boarding School) is a Spanish television drama thriller focusing on the students of a fictional boarding school in a forest, where teenagers are sent by their parents to study. The boarding school is situated in a forest far from the city, on the outskirts on which macabre events occur. The series debut on 24 May 2007, and is a production of Antena 3.
