Eleven-year-old aspiring novelist Elena loves the colorful pen the mysterious Artex gives her, especially when she realizes that whatever she writes with it comes true. But she questions the pen and its magic when it writes of its own accord about a fantasy world. The magical All-Knowers have only ever known peace until demons invade their Land of Imagining, intent on enslaving and killing them.
Elena is tied to this Land by more than just the pen - she is an All-Knower, as is Artex and her mother. She is able to control the All-Knowers with her pen, but the power comes at a cost – each time she writes with it, an All-Knower becomes a demon. After a demon kidnaps her family, Elena must go to the Land of Imagining. She will do anything, even if it means giving up her power, to save her family and her people.