I was recently introduced to Stop Surviving, Start Living by Rabbi BenTzion Shafier. He is a musmach of Yeshivat Rabbeinu Yisrael Meir HaKohen and was close to the R”Y Rav Henoch Leibowitz ZT”L. He uses the first chapter of Mesilas Yesharim as a guide to answer difficult hashkafic questions that come up everyday.
It was a real joy to read. I would highly recommend it.