The Hardy Boys, Undercover Brothers
#18, D.A.N.G.E.R. Spells the Hangman?Book - 2009
Frank and Joe go undercover at a national spelling bee where a mysterious madman known as the Hangman is determined to erase the competition! Teens from across the globe have been invited to attend, and A.T.A.C. and the Hardy Boys have to do everything they can to keep the Hangman from spelling disaster!