Focusing on Kafka's sense of Jewish identity and knowledge of Judaism, Robertson elucidates the subtle but profound ways in which Jewish religion and culture influenced Kafka's work.
This study of Kafka's work is not for the faint-hearted as it covers all the fiction he ever wrote (and more) in great detail. I put it aside for quite a while as there is a whole long section on the Zürnau aphorisms (of which I had not even heard) but decided to finish it because I thought the analysis of the Castle would be a revelation to me. It was. If you have read most of Kafka's work and are interested in its background, I would recommend this but you will find it quite expensive as it has to be printed on demand.