A Detective Story (2003)

A Detective Story is written and directed by Shinichiro Watanabe. It follows the story of a down-on-his-luck private detective Ash, on what he calls the "case to end all cases". Ash receives an anonymous phone call to search for a hacker that goes by the alias "Trinity". Ash traces Trinity learning that other detectives have failed in the same task before him, one had committed suicide, one had gone missing, and one has gone insane. Eventually Ash finds Trinity after deducing that he should communicate using phrases and facts from Lewis Carroll's Alice's Adventures in Wonderland.