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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. Written by KGF Vissers
All Episodes - S04
EPS04
Student Jane Herzfeld was fatally shot with the Glock service pistol stolen from Detective Ryan by serial killer 3XK. Her ex-boyfriend, Finn McQueen, has an alibi. Phone ...
EPS13
Dog trainer Francisco Pilar is murdered after naming Best of Show at a dog show. Castle gets the Labrador he was training temporarily adopted as team mascot, and his nose ...
EPS14
Castle senses a diary of a P.I from the 40's found in the effects of a murdered modern-day treasure hunter is the key to finding the Blue Butterfly, a blue-diamond neckla ...