Showing Decision at Delphi by Helen MacInnes

Trust, thought Strang, is more than a delicate business when involved politics are at stake. When Kenneth Strang, a young New York architect, is dispatched to the Mediterranean to sketch ancient ruins for a national travel magazine, he believes the trip is just another routine assignment. However, during his journey from Athens to Sparta - and at last to Dephi - he becomes involved with a dangerous conspiracy that threatens both Strang and his photographer companion, Cecilia Hillard. For Strang, danger is no object, but when he fell in love with the beautiful Cecilia, he gave his enemies the one weapon they needed