So Long, and Thanks for All the Fish (Hitchhiker's Guide to the Galaxy #4) by Douglas Adams

Part four of the Hitchhiker's Guide to the Galaxy trilogy of five. Featuring exclusive bonus material from the Douglas Adams archives, and an introduction from bestselling author, Neil Gaiman. 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 woman of his dreams. Fenchurch once realized 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. Follow Arthur Dent's galactic (mis)adventures in the last of the trilogy of five, Mostly Harmless.