After narrowly escaping an ancient burial ground forgotten and buried under the marshes of Cape Cod, friends of friends emerge out of the thick, muddy darkness, tattered and damn, blessed to be alive. They've already lost two of the friends within the marsh deceased. They split into take refuge and find an empty Cape Cod vacation house alongside the marsh that is foggy. All was at the marsh remains after them and soon after one of them goes to get assistance, the others of the group finds the wicked in the marsh is not the only thing which wants them dead. Something worse, something barbarous, lay in wait just in your house, outside the marsh. What happens next is terror that can not be unseen, unspeakable. These unlucky travelers spend their St. Patrick's Day trapped between 2 evils forcing them to fight, die, or go straight back the way they came.