To assist you in finding some books to consider, let me suggest two lists especially prepared for adults as well as several individual books not on the lists.
Google the following:
Paulist Press Summer Reading List for Adults
Loyola Press Reading List for Adults
Each of these printing houses offers five or more suggestions.
Beyond the printing houses, let me suggest any of the writings of Fr. Henri Nouwen. He is a marvelous writer and spiritual guide. Also consider reading the autobiography of Blessed Pope John XXIII, The Journal of a Soul.
For a unique way of understanding the death and Resurrection of Jesus a quick read is Resurrection, written by Dr. Rocco Martino. If you watch any of the NCIS genre TV shows, you will find Dr. Martino's writing captivating.
More books will be suggested in the days ahead.