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).