Batman: Legends of the Dark Knight Annual #4

Plot

The Elseworlds Annuals, the DC Universe's journey into remote realms of possibility, continue in the Gotham City of the 1930s. Elaborate flashbacks relate, following the discovery of two dead costumed men, the life of millionaire publisher "Citizen Wayne"...a tragic tale of obsession and postponed destiny. An acid attack on Gotham D.A. Harvey Dent turns him into a dark, maniacal avenger, preying on the city's underworld. Bruce Wayne may be the only person capable of stopping him, by becoming the hero he didn't want to be after the murder of his father