The first two books, which are not related to this in any way that I can figure (other than the general theme of traveling) are hugely popular in my library. I do love books about Greece, so I'm definitely purchasing this, but I wish it had mentioned the scholarly archaeology that has been done on Santorini!
Most readers won't care about this, but I was really surprised that there is no mention of the archaeological digs done in the at Akrotiri on Santorini by Spyridon Marinatos, or of Sir Arthur Evans and Knossos (although Olive does meet a man whose boyfriend is an archaeologist vaguely studying "the Minoans"). Why do I care? I was lucky enough to visit the site with Nanno Marinatos in 1985 and heard about all of the theories about Atlantis!