I wanted to re-read this book before writing a longer review and recommendation - but that is not in the cards right now, so I'll just recommend
"The end of Mr. Y" by Scarlett Thomas as a fun and interesting literary book.
At least it's fun and interesting if you can get a little excited about 20th century philosophy, among other things decontructionism and phenomenology

I don't know a lot about it myself, only enough to recognise the ideas and to look them up and read more.
Here's a review
It was a fun read, I haven't read such a fun and interesting book in a long time. There's a surface story that is good in itself, but there's also many layers, some more subtle than others. And when you're finished with it, go back to the beginning and read the first paragraph again...
I bought it as an epub version from Waterstones. I'm not sure if it's available in other formats.