Artemis Fowl and the Eternity Code is the third book of Irish children's fiction author Eoin Colfer's Artemis Fowl series. It is preceded by Artemis Fowl and the Arctic Incident and followed by Artemis Fowl and the Opal Deception. The storyline follows Artemis Fowl and his companions as they struggle to recover the "C Cube", a supercomputer Artemis had constructed from fairy technology, when Jon Spiro manages to steal it. Critical response was generally favourable.