You !
..
Emperor
Marduk
Old Mans child
Dimmu Borgir
Mayhem
Deicide
Bloodbath
Satyricon
Suffocation
Cradle of filth
Dissection
Behemoth
Deathstars
... and many more.
Horrors and sci-fi cult movies. Especially Bad Taste and Brain Dead. The Evil Dead series.
American Psyco - Brett Easton Ellis
Deception Point - Dan Brown
Books of Peter James, Stephen King and Michael Crichton