The Diamond Brothers
The Diamond Brothers is a series of humorous children's detective books by Anthony Horowitz, the first of which was published in 1986. The books tell the adventures of the world's worst private detective, Tim Diamond, and his younger brother, Nick Diamond, who is considerably more intelligent. These books are aimed at young teenage boys, slightly younger than those aimed at with the more recent Alex Rider series. However, both series star a teenage boy and include guns, fights and world-wide criminals. The most notable difference is that The Diamond Brothers series contains much more humour, with many puns, pop culture references and absurd situations. Although the books started in the late 80s and have continued into the millennium, Nick and Tim remain roughly the same age (14 and 28 respectively), while London changes with the times (the newer books feature Oyster Cards and computers for example, whereas the older books feature parts of London that have long since changed, such as smoking in offices). The entire series was re-issued in 2007 with new covers.
When released in the North American market, although the stories remained the same, the currency was changed: Therefore although Nick and Tim live in London, in the American edition they pay for everything in dollars.
The series consists of the following books:
- The Falcon's Malteser (1986)
- Public Enemy Number Two (1987)
- South By South East (1991)
- Three of Diamonds (2004):
- The Blurred Man
- The French Confection
- I Know What You Did Last Wednesday
- The Greek Who Stole Christmas (2007)
- The Double Eagle has Landed
Early editions of the Alex Rider novel Scorpia (2004), and of Three of Diamonds claimed that Horowitz was planning an Australian adventure for the Diamond Brothers, entitled The Radius of the Lost Shark. This title was also mentioned in the introduction to Three of Diamonds and at the end of Ark Angel. It was again mentioned in The Greek Who Stole Christmas, when Nick and Tim get enough money to go to Australia to visit their parents. Anthony Horowitz was asked in 2012 on twitter by a fan when this book would come out, to which Horowitz replied that he had not started on the book yet, so certainly not for another 3 years.  In 2015, Horowitz stated in a newspaper interview that there would be at least another 6 books written by him before continuing the Diamond Brothers series. 
Film and TV adaptations