So Long, and Thanks for All the Fish (The Hitchhiker's Guide to the Galaxy, Bk. 4)

There is a knack to flying. The knack lies in learning how to throw yourself at the ground and miss. It's not an easy thing to do and Arthur Dent thinks he's the only human who's been able to master this nifty little trick - until he meets Fenchurch, the girl of his dreams.

Fenchurch knows how the world could be made a good and happy place. Unfortunately she's forgotten. Convinced that the secret lies within God's Final Message to His Creation they go in search of it.

And, in a dramatic break with tradition, actually find it . . .