Watch Castle Season 4 Episode 2 "Heroes and Villains" online here: <br /><br />http://tinyurl.com/3tbp7n5<br /><br />When an ex-con is mysteriously slain in an alley, Castle and Beckett believe a vigilante is behind the murder. But efforts to identify their suspect are thwarted when they discover that he roams the city in a Superhero
