The Marathon Conspiracy is number 4 of the Athenian Mysteries, and here's the cover!
It's another beautiful artwork from professional artist Stefano Vitale. During the course of the series Stefano has moved to Venice from the US. So we have an Australian author, a US publisher and an Italian artist.
You might have noticed the bear. The bear and the skull that Nico holds are part of the story, needless to say. The stoa in the background is the Sanctuary of Artemis at Brauron. It is famous, amongst other things, for being one of the world's first school for girls.
Incredibly, we're actually organized for this book. The release details are already up on the major stores. Release date is early May 2014.