An excellent book that addresses this topic is The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene. You

An excellent book that addresses this topic is The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene. You likely already knew it but consider this a reminder to actually read it if you haven't! It was bitrotting on my Kindle for long but once I started reading, it has got me hooked!