What are some books on improving memory?
I've noticed that I often forget minor or secondary details of the novels I'm reading, especially in longer works with complex plots. I'm currently approaching the end of The Brothers Karamazov, which is marvellous, but my enjoyment of it has been slightly tainted by my own confusion when a character or event from earlier in the book is referenced and I'm left scratching my head wondering who or what the fuck it is I've forgotten.
Is there any help for this or will I have to come to terms with the fact that my memory will be forever plebeian?