Sounds like this would need pre-moderation unless you want to risk serious upset at some point. And pre-moderation is slow, plus requires knowledge of the subje

Sounds like this would need pre-moderation unless you want to risk serious upset at some point. And pre-moderation is slow, plus requires knowledge of the subject (each book) not a task I'd want to take on! Without knowledge of the book how would you know if the image was subtly offensive or a spoiler?