The Hitchhiker's Guide by Douglas Adams was the first in a series of five books that provided us with the answers to life, the universe, and everything (42 of course).
Douglas Adams passed away in 2001. Prior to his death, Adams had felt the need to continue the story: "I suspect at some point in the future I will write a sixth Hitchhiker book...", and "People have said, quite rightly, that Mostly Harmless is a very bleak book. And it was a bleak book. I would love to finish Hitchhiker on a slightly more upbeat note, so five seems to be a wrong kind of number; six is a better kind of number."
His widow has chosen another author to complete the series. The chosen one is Eoin Colfer who penned the Artemis Fowl books. And Another Thing comes out on October 12th. He risks the wrath of a legion of geeks by trying to fill the shoes of Adams. No pressure. Here's hoping he succeeds.
An interview with the author.