Tears of the Furies

When word comes to Doyle of a series of inexplicable deaths in and around Athens - men and women turned from living flesh into cold stone - he dispatches the Menagerie to Athens to investigate.

But he soon follows when he realizes that he has sent them into a far greater danger than he imagined. For the queen of the Gorgons herself has risen. To defeat her, the group will have to descend into Hell itself... and some may not return.