The Three Investigators is an American juvenile detective book series first published as "Alfred Hitchcock and the Three Investigators" . It was created by Robert Arthur, Jr., who believed using a famous figure such as movie director Hitchcock would attract attention. Random House, which is owned by Bertelsmann AG, is the U.S. publisher and still holds some of the rights to the books. Other rights are held by the heirs to Robert Arthur, Jr. and the German publisher Kosmos. The "three investigators" are: Jupiter Jones, Peter Crenshaw and Bob Andrews.
Most of the mysteries involved investigation of baffling phenomena.