Stieg Trenter was a crime writer. The main characters in many of his books are crime investigating press photographer Harry Friberg and his crime solving partner Detective Inspector Vesper Johnson. New editions of his books continue to be published. His plots has been called adequate by some experts and praised by others. His investigating main character is Friberg, from whose perspective the story is told, and this character is said to have been based upon the press photographer K.W. Gullers, Trenter's friend. Trenter's series on Harry Friberg contains 23 books.