Hi, sorry if this is the wrong place to ask this question but couldn't find anywhere else. I've just got Batman:Arkham The Riddler graphic novel and wondering if it's part of a series or not? I thought it was a stand alone book but seen the same graphic novel under killer crocs name so I thought it might be part of a series. Does anyone know if it's stand alone or not and if not how many other books there are? Thanks

@dma9411:Let me explain

There was 2 mini series called :

1. Batman: Joker's Asylum
   1. The Joker's Asylum: The Joker #1
   2. The Joker's Asylum: Penguin #1
   3. The Joker's Asylum: Poison Ivy #1
   4. The Joker's Asylum: Scarecrow #1
   5. The Joker's Asylum: Two-Face #1
2. Batman: Joker's Asylum II
   1. The Joker's Asylum: The Riddler #1
   2. The Joker's Asylum: Harley Quinn #1
   3. The Joker's Asylum: The Mad Hatter #1
   4. The Joker's Asylum: Killer Croc #1
   5. The Joker's Asylum: Clayface #1

Both collected into 2 Trades

Then DC published collected trades centered on vilains in Arkham (which include more than the pevious stories):

1. Batman Arkham : Scarecrow
   1. Batman Annual #19
   2. Batman #189
   3. Batman #296
   4. Batman #373
   5. Batman #523
   6. Batman #524
   7. Detective Comics #73
   8. Detective Comics #389
   9. Detective Comics #486
   10. Detective Comics #540
   11. Detective Comics (Volume 2) #23.3: The Scarecrow
   12. Joker's Asylum: Scarecrow #1
   13. World's Finest #3
2. Batman Arkham : Riddler
   1. Detective Comics #140
   2. Detective Comics #142
   3. Detective Comics #377
   4. Detective Comics #822
   5. Detective Comics #837
   6. Batman #171
   7. Batman #179
   8. Batman #292
   9. Batman #317
   10. Batman #362
   11. Batman (Volume 2) #23.2: The Riddler
   12. Brave and the Bold #183
   13. Joker's Asylum: The Riddler #1
   14. Legends of the Dark Knight 100-Page Super Spectacular #2
3. Batman Arkham : Two-Face
   1. Detective Comics #66
   2. Detective Comics #68
   3. Detective Comics #80
   4. Detective Comics #513
   5. Detective Comics #563
   6. Detective Comics #564
   7. Batman #234
   8. Batman #346
   9. Batman #397
   10. Batman #398
   11. Batman #410
   12. Batman #411
   13. Batman and Robin #23.1: Two-Face
   14. Joker's Asylum: Two-Face #1
   15. Batman Chronicles #8
4. Batman Arkham : Killer-Croc
   1. Content Unknown
5. Batman Arkham : Poison Ivy
   1. On sales soon

@dma9411: Was it what you were looking for ? Because those are not really graphic novels but more collected stories.

@jb681131: sorry for the late reply, been working. Yeah that's great thanks I really appreciate it, I was really confused until I read your reply. I thought what I bought was part of a series but as you say it's just collected stories. Do you know of any stand alone graphic novels that have the riddler as the main villain? Apart from the joker he's probs my favourite villain but I've not got many graphic novels with him in