So Long, and Thanks for All the Fish (Hitchhiker's Trilogy, Book 4)

The quest continues... Against all odds, at the eleventh hour, and in the unlikeliest of places of all, Arthur Dent finds the girl of his dreams. After eight years and about 100,000 light-years of intergalactic travel, he is looking a little down-at-the-heels himself, and she is heavily sedated because she thinks she is a hedgehog. She is also in the company of a brother that Arthur wouldn't wish on a Vogon. But they are both in search of God's Final Message to His Creation, and hey, this time, they might actually find it.