New series were launched in the last decades of the 20th century: the Hardy Boys Casefiles in 1987 and the Clues Brothers in 1997. The boys have distinct personalities and carry guns in the Casefiles series. The long-running Hardy Boys Mystery Stories series ended in 2005, and was replaced with "The Hardy Boys: Undercover Brothers". In these books, the boys take turns narrating their adventures, and are given their cases by a secret group called American Teens Against Crime (ATAC). The Hardys were also featured in a graphic novel series (2005), and a chapter book series for early readers called The Hardy Boys: Secret Files (2010).