Tricia's husband Daniel has been missing for seven decades. Her younger sister Callie arrives to live with her mounts to finally announce him'dead in absentia.' Since Tricia sifts through the wreckage and tries to move on with her life, Callie finds himself drawn to an tunnel near the home. As she starts to link it to mysterious disappearances, it will become evident that Daniel departure might be anything but'natural.' The ancient force at work at the tunnel may have put its sights on Callie and Tricia... and Daniel may be enduring a fate much worse than death within its own grasp.