This is a very short, but reasonably good book about raised bed gardening. If you have Kindle Unlimited, I recommend checking this out (literally) and flipping through it. It's well illustrated and to the point.
Chances are, you're not going to come away with much new from the book just due to brevity (hence the 3 star review... really I give this 3.5 stars). That said, I did see a couple of good ideas that I've not seen elsewhere - in-garden trench composting and “garden worm tubes” - I think I'll give these a try with my next garden.