Any novel by Charles Martin (and if you have a special interest in guitars, try the one called Long Way Gone.)
His non-fiction book called: What If It’s True?
Outer Order, Inner Calm by Gretchen Rubin ( great practical ideas for organizing stuff, and learning contentment)
Not Quite What I Was Planning: Six Word Memoirs (Ed. By Rachel Fershleiser and Larry Smith) (Food for thought and a fun exercise to sum up your life in 6 words!)
The Power of Moments by Chip Heath and Dan Heath
Wear out your library card while you improve your mind!