It will be published Feb. 14, and was written with Fr. Luigi Maria Epicoco.
A replica of the hand-crafted vestment can be admired at X Regio, a stone's throw from St. Peter's Basilica.
The story unfolds in the Portuguese town, which today remains a popular pilgrimage site.
“I Like to See the Sunrise” aims to go beyond the pope's obvious popularity and into the depths of his philosophical and theological teachings.