Top contender for me, Bible.
Others that come to mind ...
"Jonathon Livingstone Seagull" by " ...?.. Bach"
"John Macnab" By "John Buchan" Particularly like the Doctors diagnosis in the opening pages, And his suggested remedy " Go and steal a horse in a country where they generaly hang horse thieves !" If you read it , even just the first chapter, you'l understand.
A couple of times since I've decided to "Steal a horse..." feel in need of another lately.
and a book by Geofrey T Bull, missionary in Tibet then in solitary confinement for several years under the Chinese. A very brief but powerfull explanation of how he coped emotionaly with some of what was done to him mentaly, then his subsequent fears over wether he would ever be able to 'feel connected to anyone again'.