I don't normally outline--at most a series of short phrases, one for each chapter. That's always been fine. Until, that is, I started working on sequels. I can remember everything that is going on just fine while I am actually writing a book, but by the time I get around to writing the next one? Not so much.
So I just finished re-reading The Wicca Man: Tongue Tongued, writing out everything it establishes about the characters, setting and mythos. So now I am ready to start on part two in which we discover exactly who the God of Shadows is. God of Shadows? you ask. Maybe you need to re-read it too. Or read it. Buy a copy in time to be ready for the sequel!