The Angry Mountain

An adventure thriller set in the 50s, after World War II but prior to the eruption of Mt. Vesuvius, of which said eruption happens to be the book's finale. The main character has to deal with his own demons as well as the enemies of his past as a simple trip ended up with him being embroiled in industrial espionage. I wasn't much impressed with this, but that could be due to the setting and my youth).