What book are you reading?

[The Magic Pudding]

Terry Pratchett - Unseen Academicals

Douglas Adams - And Another Thing, I don't know why I haven't already read it but when it's described as part six of three, it is confusing.

Just FYI, Eoin Colfer wrote And Another Thing, and it's described as the sixth part of a trilogy because, after the release of the third book, it was described as a "trilogy," and with the release of the fourth book, either Douglas Adams or his publishers decided to keep the moniker of trilogy as a joke.

Eoin Colfer, right you are.
That explains how a new Hitchhiker book has appeared without the author being alive to write it.