Zen and the Art of Motorcycle Maintenance by Robert Pirsig
A semi-autobiographical telling of a 17 day motorbike journey by the author and his son in the late 1960s as they travelled across America.
It has lots of philosophical discussions, and a descent into darkness and through the otherside of the author.
It can be a bit heavy but it resonated with a personal journey I was on myself at the time of reading.
https://en.wikipedia.org/wiki/Zen_and_the_Art_of_Motorcycle_Maintenance
Love it!! His obsessive need to find the answer to his question s resonated with me, and there are nice gothic touches in the telling of his story too
