I can't think of any that speak about cultural context and the runes at the same time... That would take a library. But there are good places to start when trying to puzzle out the cultures they came from. One good starting place, which I recommend to anyone trying to understand the heathen worldview, is Culture of the Teutons by Wilhelm Grönbech. It goes very in depth into pre Christian Germanic culture as a whole, taking especial care to explain concepts that are foreign to the modern Western way of thinking. Understanding is often a hard road to walk in this respect, as well, since many conceptual terms we still use today (such as luck or honor) have little in common with their old meanings. And there are others (like frith) that don't really have any modern equivalents.
Now, to be fair, CotT can be a rather daunting book. I mean, it's an academic text written over 100 years ago... And while I feel it's fairly approachable, especially when held up against other academic texts of the day, it's still a 100 year old academic text. Perhaps a better one, and only as a start, would be a beginners text on heathenry in general. Personally, I think most of them are crap... But there is a very good one I can recommend. It's called A Practical Heathens Guide to Asatru by Patricia M. Lafallve.
Long story short, as I alluded to before, the runes are not something for the beginner. I'm talking years of study before they should be messed with. And even then, never outside of the context of heathenry. And it should also be remembered that most of the books about there about using them are complete MUS (or UPG if we want to be nice about it. Which I don't, because I'ma heathen and we're terrible people). If, for example, it's trying to teach runic divination, it's MUS. There is very, very little evidence of using the runes for divination and NO record of how it might have been done.
Anyhow, I'm rambling at this point. I have a pet peeve about both cavalier use of the runes, and use of the runes outside of a heathen context. So I tend to go on about it, at length, when the topic comes up. Heathens can get touchy about that sort of stuff... there's a lot of modern history of our sacred being profaned, sometimes in the most vile ways.