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 person such as movie director Hitchcock would attract attention. Random House, which is owned by Bertelsmann AG, is the U.S. publisher and still has some of the rights to the books. Other rights are possessed by the heirs of Robert Arthur, Jr. and the German publisher Kosmos. The characters known as the "three investigators" are three boys named Jupiter Jones, Peter Crenshaw and Bob Andrews.

Most of the mysteries involved investigation of baffling phenomena (e.g. an ancient Egyptian mummy that apparently whispered and a human skull that seemed to talk).