当五个朋友在一个偏远的湖畔度假时，他们期待着一个不错的时光，不知道地球正在遭受外星人入侵和大规模绑架。

1945. A U.S. military cargo plane loses control and violently crashes behind enemy lines in the middle of the German black forest. Major Johnson sends a squad of his bravest soldiers on a rescue mission to retrieve the top-secret material the plane was carrying, led by Sergeants Brewer and Walsh. They soon discover hanged Nazi soldiers and other dead bodies bearing ancient, magical symbols. Suddenly their compasses fail, their perceptions twist and straying from the group leads to profound horrors as they are attacked by a powerful, supernatural force.

A group of college friends discover a 15th century coffin that allows them to experience the world as ghosts. While their first adventures in the spirit world are playful and innocent, the "Box of Shadows" soon brings out the group's most dangerous impulses and desires. The friends find themselves pulled into a world of evil where they learn the line between life and death is there for a reason.