Robin LaFevers 
Theodosia and the Staff of Osiris [EPUB ebook] 

Theodosia Throckmorton is in a fix. While attending a reception given by one of the directors of her parents’ museum, she stumbles across an old foe in the most surprising circumstances! His reappearance could mean only one thing: the Serpents of Chaos are back. Once again Theodosia will have to take on secret societies, evil curses, and dark magic too sinister to imagine, especially if it falls into the wrong hands. Blocked at every turn, Theodosia must rely on her own skill and cunning – along with a little help from her friends.