This time a logic recommendation. I got in the post today a copy of the recently published paperback version of José Ferreirós, Labyrinth of Thought: A History of Set Theory and its Role in Modern Mathematics. History of mathematics is not at all my thing, but I got it as it seems very well regarded, and I wanted to have more sense of how we got to where we are with set theory. Having dipped into it over a couple of leisurely coffees in a cafe this afternoon, it seems very approachably written and intriguing. It is still jolly expensive; but at least make sure that your library has a copy.