I read Raymond Khoury’s “The Sanctuary” and “The Sign” back to back, even though they don’t share any of the same characters. They’re both thrillers and page-turners.
“The Sanctuary” deals with a search for a life-extending elixir and the ethics involved with presenting it to the world if found. “The Sign” deals with how technology-induced phenomena could be used to manipulate people’s religious beliefs.
While being very entertaining, the books did have (in my opinion) important messages and were very thought-provoking.