The serenity of yet another quiet evening alone is shattered for amateur photographer, Richard. Desperate, frightened and uninvited, Samantha has taken refuge in Richard's sprawling, suburban home. Is there substance to her fear and paranoia, or are substances the cause? Is her arrival a break-in or an escape? As she seeks salvation from savage retribution, Richard is forced to fight Samantha's battle for survival in order to save his home, his life and his sense of humanity.