Plan 9 from Bell Labs book

Question

I would really like to obtain a book on Plan 9's design and ethos. Do such things exist?

Anybody have a recommendation?

(Asking here on the basis that Plan 9 was once meant to be Unix's successor, AIUI)

Answer 1

cat-v has a Plan 9 doc archive that contains a number of papers, manual pages for various editions and other interesting miscellanea.

Answer 2

Introduction to Operating Systems abstractions using Plan9 from Bell Labs might be of your interest.