This is a classic garden-path sentence [1] if I ever saw one. It happens sometimes in "headlinese" when editors or authors try to squeeze as many characters out of a headline as possible.
"[A] note[,] in which [The] Hitchhiker's [Guide To The Galaxy] writer reminds himself he will [']finally get pleasure from process['][,] is] to be part of [a] book based on his archive."