Patience,
I very much like your idea of light reading. If that is your idea of light reading, then I'd strongly suggest Sigrid Undset's Kristin Lavransdatter, for which she won the 1929 Nobel prize for Literature. Also, her Master of Hestvikken, which is far better in my humble opinion, and even more Catholic.
Then there is Henry Sienkievich's Quo Vadis, Diary of a Country Priest by Bernanos, Till We Have Faces and the Great Divorce by C.S. Lewis. Also, War in Heaven by Charles Williams. The last three are non-Catholics with an essentially Catholic message.
If you enjoyed the Chronicles of Narnia, you might poke your nose into the writings of George MacDonald, C.S. Lewis' literary mentor. He has a number of novels for young people which Bethany House put out. I got them for my daughter, but enjoyed them and profitted from them myself. These are not of great literary quality, but he usually has a good story and some wonderful, even stunning insights. Again, MacDonald is not Catholic, but the message is fully in accord with the faith.
If you haven't read Thomas Merton's autobiography The Seven Storey Mountain and its sequel, The Sign of Jonas, you're really missing out. It is the story of how a well educated young man finds his way into the Church, and then into a Trappist Monastery. The sequel has to do with his life in the monastery.
Also, read the Cure of Ars by the Abbe Trochu, the bio of St. John Vianney. This is a huge book, very well writtten and dramatic, one of the few full length bios of a modern saint that we have.
Another worthwhile priestly bio, also an autobiography, is that of Fr. Walter Ciszek, S.J., who grew up in Shenandoah PA (my wife knew his family, since she is from there also)joined the Jesuits, was sent to Rome to study for eventual work in Russia, was posted to Poland, and was swept into Russia by the Soviet Army, where he spent many years in concentration camps in Russia, ministering to the prisoners. An incredible story.
You've got to read Story of a Soul by St. Therese, Isabella (the story of Queeen Isabella of Spain) by William Thomas Very inspiring.
But why go on, that's your whole summer right there! And don't forget Mr. Blue by Myles Connelly.
Lee