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讲述了一个美国国防部高级研究计划局科学家接受一项致命任务，带领一队精挑细选的三角洲部队士兵进驻一个被战争摧毁的城市，这里游荡着被称为“幽冥”的神秘幽灵，它们无形无色，能在不经意间造成大规模的伤亡。。由于工作的原因，马德琳（艾伯丝·戴维兹 Embeth Davidtz 饰）常年奔波在外，除了身心疲惫外，和家人的联系也日渐减少。这一次，利用难得的工作机会，玛德琳决定和丈夫乔治（亚历桑德罗·尼沃拉 Alessandro Nivola 饰）回家拜访，没想到自己的贸然来访居然惹出了诸多的麻烦。 脾气暴躁毫无耐性的母亲佩格（西莉亚·韦斯顿 Celia Weston 饰），冷漠寡言个性压抑的父亲尤金（斯科特·威尔森 Scott Wilson 饰），遗传了母亲的暴躁同时还带有年轻人的任性不羁的弟弟约翰尼（本杰明·麦肯锡 Benjamin McKenzie 饰）以及他那身怀六甲，敏感而又絮叨的妻子艾什莉（艾米·亚当斯 Amy Adams 饰），虽然体内流着相同的血缘，但站在这些人中间，玛德琳感到自己是如此的格格不入，而本该温馨的修补亲情的拜访，眼看着就要变成一场...。While rowing out in the ocean, Mitch rescues an underwater photographer, named Linda, floating on some wreckage. Linda's somewhat disjointed, frantic story about something attacking her in an underwater cave which killed her partner and destroyed her boat is misconstructed by Kay Morgan, an ambitious, publicity seeking newspaper reporter, who creates a media frenzy by starting rumors about a "creature in the bay." Harvey Miller, the new lifeguard and prankster, benefits from the events by selling undersea creature T-shirts. Meanwhile, Shauni rescues a young girl from drowning and soon becomes compelled to rescue the girl, her brother and their mother from the life they live in the slums of South-Central L.A., much to Eddie's chagrin. While Shauni deals with her possessive father who disapproves of her lifeguard job, Mitch also pressures Captain Thorp to ask for funding for new advanced motorboats, called Scarabs, for the team.。