哲學系學生肖墨到殯儀館實習，試圖探尋“生死”答案，卻遭遇導師陳輝離奇死亡。村里流傳一口“應聲井”可讓人起死回生。陳輝之子死于事故后，陳輝在古井許愿，次日離奇失蹤。肖墨隨神秘殯葬師老白頭返村調查，老白頭以科學逐一破解“靈異”現象：井中尸體、養女上吊、濃霧里的鬼打墻等怪事背后皆是精心布局的騙局。當執念遭遇科學，謊言被真相撕裂，眾人方知真正的深淵不在井里，而在人心。

Four friends wanted to get away from it all for a birthday celebration in a remote country house, but when a mysterious injured man turns up on their doorstep telling tales of a city ravaged by a mysterious epidemic and the looters who have pursued him, the friends rally to help. As the night progresses, it becomes clear that all is not as it seems, plunging the friends into a battle for survival that challenges their deepest fears.

　　影片講述善良的外賣騎手劉大鵬偶然救了一位富翁，對富翁千金馬小蕓一見傾心，而馬小蕓正陷入一場險惡圈套中，劉大鵬挺身而出，幫助馬小蕓戰勝邪惡的故事。

　　在第三次世界大戰期間，美國政府發起了一個秘密的項目代號為“陸軍培根”，以創造超級士兵近交人與豬。25年后，一種叫做“槍口”已經占據食物鏈的頂端，吃和人類飼養動物一樣。羅布正義是一個前賞金獵人工作的最后一行人類抵抗-一組幸存者躲藏在核掩體深處地下。他的任務是找出槍口上臺并消滅他們。