Emily Sweet delivers a strong, and very believable, performance as "Cass" in the first half of "Eight Eyes." Unfortunately, this character study is lost (or at least put to the side) in the second half of the film.
Sweet is entirely credible as the increasingly exasperated young wife of "Gav" (Bradford Thomas) who befriends the rather odd "Saint Peter" (Bruno Veljanovski) during their journey through Serbia. The smiling (or is it smirking?) Saint Peter functions as their erst-while tour guide from early in the film, though Cass almost immediately suspects he is not what he represents. She certainly resents Saint Peter's inappropriate comments and hair-trigger tendencies, despite Gav's decision to continually placate their new "friend" in the name of getting along.
Of course, it is Cass' suspicions that eventually prove correct, but by that point the film has left behind the careful character studies and simply copies (as other viewers have noted) such films as "Hostel" and the "Texas Chain Saw Massacre." The second half does not so much suffer from this decision as waste an opportunity to be a different type of entry.
P. S. If you don't want to watch a plus-sized man walk around in all his bare, natural glory, you may want to skip the second half of the film.