A Conspiracy of Kings is a young adult fantasy novel by Megan Whalen Turner, published by the Greenwillow Books imprint of HarperCollins in 2010.

[3] The trade paper edition of August 2011 appends to the novel an original Queen's Thief short story, "Destruction", and several nonfiction items.

The gods of Turner's pantheon, ruled by the Great Goddess Hephestia, are her own, and her world possesses such items as guns and pocket watches.

[4] Sophos, the Magus's once studious young protégé, finds himself out of his element as his family is ambushed in their villa in Sounis.

Aided by the Magus, he turns to his old friend Eugenides, the former Thief of Eddis, with whom Sophos traveled years before and who is now the King of Attolia.