This is one of the 20 best RPG books I own- great ideas and background material in it. I've used critters from it in my Kult games, as well as a few critters for Deadlands and D&D. About a third of the creatures in the book are more modern-ish in nature, but the others would be easy to slot into a fantasy game. There are 26 creatures in it, each with a 5-10 page writeup as well as very good art and drawings for each creature, including:
Blood Corpse
Blossomer
Clootie
Death Tapper
Dementia Larvae
Dream Terror
Drowner
Feral Drowner
Kooks
Man at the Bar*
Mystery Man
Organ Grinder*
Outsiders
Ovvashi
The Practice*- Mortician*, Surgeon*, Nurse*
Residue Daemon
Scourger
Shatterer
Sisterite*
Sleep Hag
Snuff Golem*
Strap Throat
Torture Dog
* modern setting specific
There are also about a dozen artificats listed- items of occult power. These are not your "pick up and get leet powerz" items though- they are potent, but requires significant penalties and sacrifice to use. Finally, the last five pages have advice on running horror campaigns. All in all, a great book- and if the Esoterrorists is similar to this, I'll definitely be picking it up.