Side note, but some people have such an evident talent for writing that it makes reading about _any_ topic a worthwhile experience. This author, Stefan Kruger, seems to be one of them.
I almost wish this link was to a blog rather than to a book about K, for which I only have a perennial curiosity.
Here's to hoping they consider writing said blog. I notice they have one but it only has 3 posts, all of which are about past Advent of Code puzzles.