Sebastian David Fitzek is a German writer and journalist. His first book, Therapy (dt. Die Therapie), was a bestseller in Germany in 2006. Therapy was nominated for best crime-debut for the Friedrich-Glauser-Award. His next novel, Amok game, was released in 2007 and Goldkind Film AG bought the movie rights for it. In 2018, The Package was the bestselling work of fiction in Germany.