In the British countryside, the Harver family head out on an idyllic summer camping trip where they can bury past tensions and enjoy some family bonding. But when their camp is sabotaged by an unsee...

　　在一个偏僻的山顶，有位神秘的陌生人从暴风雨中出现，向惠普利一家寻求庇护，而惠普利一家有著三个被妈妈严格管教的年轻人，以及失踪未果的神经质爸爸。这神秘的「陌生人」到底与惠普利一家和这间诡异的古堡有什麽关联？更可怕的是，某个夜晚，惠普利发现自己浸在血液中，束缚在床上无法动弹……...