Batman: The Long Halloween is an arc in the Batman comics from the 1990's. It quickly became one of the most beloved Batman arcs.

The Plot:

Batman, James Gordon and Harvey Dent try to solve the mystery surrounding a murderer calling himself Holiday. Holiday is antagonizing against Carmine Falcone, the most powerful mob boss in Gotham City. While Batman tries to put the pieces of the mystery together, Holiday and Falcone compete against one another with the help of members of Batman's rogues gallery.

Characters:

Batman
James Gordon
Harvey Dent
Gilda Dent
Carmine Falcone
Catwoman
The Calendar Man
Alberto Falcone
The Joker
Poison Ivy
The Scarecrow
The Mad Hatter
Solomon Grundy
Alfred Pennyworth
Sal Maroni
Sofia Falcone
Thomas Wayne
The Riddler