A group of young people, guided by an APP that connects living with the dead, find themselves at an abandoned castle. A place with a horrific history tied to each of them, for reasons theyll soon discover.

彼此互不認識卻同時被綁架的六個陌生人，昏迷醒來後卻發現被囚禁在有人看守的密室中。一道不知名的聲音傳來要求他們六人必須在時限內，共同決定哪一人有資格安全離開這裡。究竟誰能夠問心無愧？誰又可以拆穿這精心設下的陷阱呢？