Short, mindless, captivating

I need a palate cleanser from all the long romantasy series and 600-page books.

So, now I’m looking for something shorter (300-400 pages), standalone, no romance, easy mindless read and still captivating enough that I’ll pick it up and read in a day.

I’m reading Sourdough by Robin Sloan right now, but it’s honestly a little too ”densely” written. I don’t know how to describe it. Like I have to concentrate when reading, rather than words just flowing.