This one I read because (surprise!) of the TV series of the same name with Richard Chamberlain in the main role.
I'm surprised to hear you have any time for movie novelizations. I read a few years ago and they were awful. You say they add things, but what they add is worthless and meanwhile they can't write to save their lives (which is why they're copying someone else's work). Actually, Empire did a funny article on them a while ago and they all seemed like bitter hacks! I wouldn't waste time setting those books on fire.
Just to be clear, in case of Shogun the book was there first. And this is the series with Chamberlain: IMDb, Amazon
Wow I didn't even know there were novelisations for Batman Begins or The Dark Knight. I had this idea thatit's book first and then the film follows, but I suppose they do some the other way around as well.
Well now I'm just interested to give one a go. Hmm, I wonder if any have been made from Tarantino films
I try to always read the book first. Although I often enjoy the movie, I usually think the book is better. The Shining is a perfect example - I loved the movie but the book is even better.