I was watching an old 'Dr. Who' show from Netflix and noticed it was written by Douglas Adams. I went to Wiki to see what else he may have written besides HH-Guide and the two Dirk Gently novels. He had written a number of radio and TV comedy episodes and a couple of Dr. Who stories. These included some Monty Python skits. He also wrote some non-fiction about saving animals.
The Salmon of Doubt was published posthumously. It is a collection of bits and pieces of stuff with the largest part being an unfinished Dirk Gently novel called The Salmon of Doubt. The title is a reversal of the Irish mythical story of The Salmon of Knowledge. A lot of Adams' comedy revolved around God and religion. He enjoyed the topic because he himself was a devout atheist.
I put in on hold at the library.