From the back of the book:
Modern-day fantasy meets Greek mythin this unique role-playing game. Nine Worlds is ideal for players looking to create exciting, magical drama. This game provides players the tools to create incredible stories set in a universe full of magic, myth, tragedy, and redemption.
Players portray Archons -- mortal humans caught in a cosmic cold war between the Greek Gods and Titans. The game master guides them among the Nine Worlds, testing their loyalties and tempting them towards rebellion.
Will your Archon support the immortal rulers of the universe? Or, will your Archon break their laws and help shape a new reality?