影片围绕着心理学家皮特与他被“鬼混”侵扰的病人之间展开，随着病情研究的深入，隐藏在恐惧背后的可怕事件也将渐渐浮出水面。...

Five women participate in a hiking retreat but only four come out the other side. Federal agents Aaron Falk and Carmen Cooper head into the mountains hoping to find their informant still alive....