From the back of the core rulebook:
Full Moon Rising
The world is in shadow. To one side stretches the forest, to the other the city. Your claws are stained with blood. Your senses whisper of prey that runs before you, and of predators who stalk even the likes of you. You hear the howls of your brothers and sisters. Luna rises. Your blood boils. It is time to hunt.
Wolves at the Door
Werewolf: The Forsaken - the game of bestial violence and supernatural terror - is the second core setting sourcebook intended for use with White Wolf’s new Storytelling System. Werewolves are creatures of original sin, tainted by ancestral crimes and driven to hunt by the shame of being abandoned. This book details what it is to be Forsaken, one of the Tribes of the Moon. Create your own werewolf pack and seek redemption or give in to your savage nature.
In Werewolf: The Forsaken, the second Storytelling game set in the World of Darkness, you and your friends tell the story of some of these monsters, namely those abandoned men and women who inherit the legacy of the werewolf.
Neither wholly spirit nor flesh, the Uratha (as werewolves call themselves in their ancient language) are creatures of two worlds. Since the beginning of time, they have tended the Shadow Realm while staking out territory in the physical world and ruling it as the ultimate apex predators. Yet for the sacrifice of their ailing forebear, the Uratha have been forsaken by their former spirit allies and consigned to a physical world that knows only fear. Now they can rely only on each other, their mother Luna, and what few spirit allies they've managed to wrestle back into submission. They must stand on the threshold between two worlds swarming with enemies.
Despite their outcast state, the werewolves are not helpless prey. They can assume any of five natural forms, each with its own special advantages. They can heal even the most grievous injuries in seconds. The allies they have regained in the Shadow Realm have given them special Gifts and taught them special rites, each with profound magical effects. Their fickle mother Luna has graced them with her love and divided their slain father's legacy between them, each portion corresponding to one of the moon's five phases. And when their spirit prey tries to escape into the Shadow Realm, they can even pursue it across the Gauntlet that stands between the sundered worlds. As long as the Uratha can keep the disparate urges of their divided souls in harmony (balancing spirit and flesh while also balancing beast and man), they stand to inherit the mantle to which they were born.