Heroes and Villains

Plot:

Sex offender ex-con Tyler Faris is found in an alley, cut in half by a sword. Faris' victim claims that a man in a superhero uniform saved her. Even Castle doesn't recognize the uniform, which is eventually identified as Lone Vengeance, the hero of an Internet site authored by Sean Elt, a pseudonym. Actually, several people prance around New York in Lone Vengeance suits. The team investigates them and Tyler's enemies, such as his former employer Tony 'The Butcher' Valtini, thus proving to Captain Victoria Gates her lack of confidence in them is unwarranted.