I became familiar with Kreeft's work when I read his _A Refutation of Moral Relativism_; checked it out from my local library and held on to it for several weeks, reading it front-to-back several times.
Prof. Kreeft uses 40 "tags" to introduce key precepts of philosophy - the love of (the search for) wisdom - and illustrates those tags with excerpts from Plato's "Apology".
Cleanly written, easily comprehensible, and enjoyable, I can't wait to get my hands on more of Dr. Kreeft's work (I have a few items of his in my cart already!).
With a few more works like this, we ought to be able to reverse two centuries of reductionism and relativism disguised as "Enlightenment" and fight the new generation of Sophists back into their caves.