"So Long, and Thanks for All the Fish" by Douglas Adams
I don't know if it's me or if the books in the series become less and less coherent with every consequent issue. This book was challenging to read because the plot was so complex to follow. I mean, no one reads Adams for the plot, but even the jokes are somewhat scarce.
The author basically tells us the book is about Fenchurch (Arthur's love interest). Still, it's mainly about Arthur searching for Fenchurch, talking to her, flying (yes, again) with her, having sex in the skies (yes, that happened in detail), then it turned out dolphins saved the Earth, and now we're onto the multiverse.
Ah, and then the final God's message to the world, which is very anticlimactic, similar to 42. I get the joke, still, for some reason, I expected more from the fourth book. Still, mostly it's a "me" problem, not the book's one.