It's a deadly game we play, Batman. When you can't follow the rules anymore, it's time to quit. 
- — Andrev
Detective Comics #634 is an issue of the series Detective Comics (Volume 1) with a cover date of August, 1991.
Synopsis for "The Third Man"
Batman investigates a murder mystery with the assistance of the Biddee sisters, a couple of elder, amateur detectives.
Appearing in "The Third Man"
Featured Characters:
Supporting Characters:
- Beatrice Biddee
- Penelope Biddee
- Gerald Kopfel
- Rolf Lang
- James Gordon
Antagonists:
- Christina D'Urbon
- Andrev
- Uli Hahne
- The Thespian
- Vice-Chancellor Schmidt
Other Characters:
- Agent Briggs
Locations:
- Gotham City
- Gotham Railway Station
- Swiss Embassy
- New York City
Items:
- Bat-Signal
- Batarang
- Bar of Cocolat Suisse (chocolate)
- Rolf Lang's untraceable handgun
- Christina D'Urbon's revolver
Notes
- This story is reprinted in Batman: The Dark Knight Detective Vol. 7.