The stories are a mixture of many different genres, including adventure, satire, and social commentary and changed over time. Twenty-three completed books, came out between 1929 and 1976. A twenty-fourth story, "Tintin in Alph-Art", was never officially finished following the death of Hergé in 1983. There have been many unofficial books, but most of those are parodies or not part of the official series. The books in the official series are: