"Mostly Harmless" by Douglas Adams
"You live and learn. At any rate, you live."
"Mostly Harmless" is the last book in "The Hitchhiker's" series. It was published in 1992, about nine years before Douglas Adams' death.
I liked this book better than the previous installment, "So Long, and Thanks for All the Fish," but it was a bit of a downer. Subplots involving a corporate takeover of the Guide offices, and Arthur's lost daughter border on the depressing, although there are some genuinely funny moments in this book.
According to Wikipedia, Adams had planned a sixth book to end the series. Unfortunately, he didn't live to write that one. Another writer has gone on to write this sixth book, but I refuse to read it. A "Hitchhiker's" book that's NOT by Douglas Adams? Why bother?