Detectives in Pop Culture

The Anime "Sword Art Online" has two episodes in which the main characters, essentially knights, get to play the detectives. In episodes five and six, the duo pursue an assassin who is killing former members of a guild who are believed to be in some way responsible for the death of another member. They solve the mystery, confronts confusing events and a group of murderers, ranking as a high on my list of detective mysteries.