Yes, yes I'm late yet again. Sorry! I was going to post it last night. Then again getting home at 2:30 in the morning after watching Iron Man 2 kind of killed that idea. :P Then work of course just ruins everything and my internet is out to get me I tell yee!
Okay I shall delay no further. Here is the 7th clue!
In Catherine Fisher's novel Incarceron, only one man has ever escaped the prison. What is his name?