Part of being the World's Greatest Detective is having the determination required to train for the role in the first place. Following the death of his parents, Bruce Wayne left Gotham City and trained abroad for twelve years to hone the detective skills he would need to conduct his war on crime.

Harvey Bullock (/ˈbʊlək/) is a fictional detective appearing in American comic books published by DC Comics, commonly in association with the superhero Batman. The character first appeared in Detective Comics #441 (June 1974) and was created by Archie Goodwin and Howard Chaykin.

Detective Comics #27 was published in May 1939. It serves as the debut of Batman in comics in a story titled "The Case of the Chemical Syndicate". The issue follows Batman's investigations in the murder of an industrialist and his partners. The story was written by Bill Finger and presumably drawn by Bob Kane.