This was my first Mary Stewart, and I must say I did enjoy it. We're in a sort of female Eric Ambler world, here, without the politics: Europe in the 1950s, with the War looming large in the collective memory; this plot, though, is wholly personal.
Told from the point of view of the accidental heroine, the story gets off to a rather tediously drawn-out start (perhaps it's just old fashioned, this idea that driving a car is such a big deal!), but soon gathers a pretty good momentum, picking up some nicely unpleasant characters on the way. I loved the whole mental landscape: pure young James Mason as directed by Alfred Hitchcock.
Greece in general, and Delphi in particular, are rendered beautifully, and credibly. Apollo, too, makes a welcome appearance.