Ok, so the quest marker for this leads me to Wolfskull cave, which I've already cleared for an earlier quest. The marker is there inside, but no book/scroll. Anybody else have this issue or an answer on how to fix? I am on Xbox.

Have you tried waiting 30 days so the cave can respawn?

Yes, it had re-spawned, because I cleared it ages ago, but still nothing other than some draugr, necros and skeletons. Just a marker with nothing there. Thanks for the response though.

search around the area of the quest marker.