Given the question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. The Forbidden City (Grey Star) - The Forbidden City is the second book in the World of Lone Wolf book series created by Joe Dever and written by Ian Page. It is one of four books in the mini-series and features Grey Star for whom the first book is named a young Wizard trained by the enigmatic Shianti to stop the Wytch-King and his Shadakine Empire. All four of the Grey Star books were released by Project Aon along with many of the other installments of the Lone Wolf series.
The answer is:
Written Work