Books to read if you are visiting Portugal...

Night Train to Lisbon by Pascal Mercier (I also recommend the movie of the same name)

Two Nights in Lisbon by Chris Pavone (I am going to read this one, because I am going to Portugal soon and I loved his book The Expats)

The Librarian Spy by Madeline Martin (I really enjoyed this story. It's rare to learn about Portugal during WWII in historical fiction. I loved the espionage aspect)