The World of Darkness: Storytelling System Rulebook is the core rulebook for White Wolf's modern horror series, World of Darkness. This book has everything you'll need for running a game of supernatural horror. This book is also required to run a game of Vampire: The Requiem, Werewolf: The Forsaken,Promethien: The Created, or Mage: The Awakening.

From the back cover of the first printing:

The world is not what you think.

Beneath skyscrapers'
leering gargoyles,
factories belching smoke
and streets packed with
the human throng
lurk things we are
not meant to see.

Creatures dwell in the shadows
and hidden places.

They watch you,
stalk you,
and prey upon
your body and soul.

The life you lead is a lie.
Your darkest fears aren't make-believe.
They're real.

And now that you have glimpsed
this world of darkness,
there's no place to hide.

The Storytelling System Rulebook is a
stand-alone game for the World of Darkness,
and is meant for use with Vampire: The Requiem,
Werewolf: The Forsaken and Mage: The Awakening.