The Dead Sea Cipher by Elizabeth Peters, for the #1970Club

In this romantic suspense novel, a young woman on a trip to the Holy Land finds herself in danger and does not know who she can trust or even who her pursuers really are. Dinah Van der Lyn is an aspiring opera singer who is about to get her big break – filling in for a pregnant soprano at a small opera company in Germany. Well, she knows it is more of a little break, so maybe that’s why she is in no hurry to get there.