This edition is the last one, before White Wolf has brought the old World of Darkness to an end.
The book contains all the core rules needed for a RPG (character generation, skillchecks and so on).
A big part of this massive book contains background information on Werewolf (Garou) Society, their magic Powers (Gifts), the parallel World "Umbra", the enemies of the Werewolves and information for the Gamemaster, or better, the Storyteller.
This edition includes the "Prophecy of the Phoenix"
A Tale of the seven signs which announce the end of the world - the Apocalypse.