Jef Geeraerts is a Flemish writer. He was a colonial ruler in Belgian Congo. When the liberation came along he sent his wife and children back to Belgium and not much later he went back to Belgium himself. There he got his honorary pay and pension. This was so much that he never had to work again in his life. To get out of the house and away of his ordinary family, he went to the University of Brussels to study the Germanic languages.

When he finished his study he wrote his first novel: Ik ben maar een neger ("I'm just a nigger") which put him on the map as extremely controversial. He wrote more of these politically motivated colonial books before he strated his Gangreen serie. There are 4 parts, Gangreen 1 (Black Venus), Gangreen 2 (De Goede Moordenaar), Gangreen 3 (Het Teken van de Hond) and Gangreen 4 (Het Zevende Zegel). His books were pulled out of the shelves by the Belgian army because of their shocking truth about the army's way of handeling bussiness in Congo. Nowadays he is a celebrated crime-novellist. His books are oftenly filmed and the rewards keep streeming into his livingroom. He is seen as the best crime-writer of the Dutch language.