Great contest but I can't tell you just one title.
Three books changed my life to tell the truth.

The first was "TREASURE ISLAND" written by Robert Lowis Stevenson. I read it when i was eleven years old.
At seventeen years old i discovered "WAIT UNTIL SPRING, BANDINI" by John Fante.
The third: "WAR AND PEACE" by Lev Tolstoj. In my hand at thirty-five years old.

The first turned me on literature.
The second made me realize the power of literature.
The third is definitely the Book.

p.s.= on my blog you can find some book reviews, take a look ;)
https://steemit.com/@pekisch