What follows is a brief summer reading list comprised of Catholic books, organized by general subject. I have read all of these books (hence why I can recommend them; please feel free to ask me about any of these titles that may strike your fancy):

Spirituality

Confessions — St. Augustine

Essence of Prayer — Sr. Ruth Burrows

Practice of the Presence of God — Brother Lawrence

The Four Loves — C. S. Lewis

When the Lion Roars — Msgr. Stephen Rosetti

Christology (the theology of Christ)

The Jesus of Nazareth series — Pope Emeritus Benedict XVI

The Everlasting Man — G. K. Chesterton

Liturgy

Heart of the Christian Life — Pope Emeritus Benedict XVI

Spirit of the Liturgy — Joseph Cardinal Ratzinger (Pope Emeritus Benedict XVI)

In Memory of Me — Milton Walsh

Apologetics

Born Fundamentalist, Born Again Catholic — David Currie

Answering the New Atheism — Scott Hahn

Rediscovering Catholicism — Matthew Kelly

Fundamentals of the Faith — Peter Kreeft

Be a Man! — Fr. Larry Richards

Christian Philosophy

Making Sense of Suffering — Peter Kreeft

The Hungry Soul — Leon Kass

Fiction

The Power and the Glory — Graham Greene

The Great Divorce — C. S. Lewis

Till We Have Faces: a Myth Retold — C. S. Lewis

A Canticle for Leibowitz — Walter Miller

Quo Vadis — Henryk Sienkiewicz

The Lord of the Rings — J.R.R. Tolkein

Brideshead Revisited — Evelyn Waugh