An Ex Marine returns home to his pregnant wife a broken man. Suffering from PTSD, she battles to console him as he struggles to keep it together, slipping further into a paranoid delusion. When he is offered another tour of duty, she pleads for him to stay. Their home is invaded by a group of sick and twisted psychopaths who terrorize them both, but that's not the only thing invading... An unidentified species is also in the house, descending upon them with a fury of unimaginable horrors.