This is a fun genre mashup B-movie, in the vein of old John Carpenter films or those movies you used to run across on late-night cable in the 80s and early 90s. Dan Stevens (that handsome chap from Downton Abbey) gives a knock-out performance as the titular guest (David), who in the movie’s beginning has just shown up on the doorstep of the Peterson family. He says he’s there to pay his respects to the family -- he served with their son, who died in action -- but there is something just a little bit off about him. Everyone in the family is charmed by David except for daughter Anna (Maika Monroe), who approaches him with extreme caution even though she’s clearly impressed by his six-pack abs. The films starts at a slow burn before devolving into nutty, violent chaos, but maintains a dark cheeky sense of humor throughout. The goth pop soundtrack is also killer.