Non-fiction:
G.K. Chesterton's Orthodoxy
Benson's The Friendship of Christ
Scott Hahn's Lord, Have Mercy
Thomas a Kempis' The Imitation of Christ
Patrick Madrid's Surprised by Truth I,II, and III
Fiction:
C.S. Lewis' The Lion, The Witch, and The Wardrobe (all the Narnia books really)
Graham Greene's The Power and The Glory
Ernest Hemingway's Farewell to Arms
Graham Greene's The End of the Affair