High Quality Content by WIKIPEDIA articles! Warnings at Waverly Academy is the 21st installment in the Nancy Drew video game series created by Her Interactive. It is preceded by Ransom of the Seven Ships and followed by Trail of the Twister. The story is based on Nancy Drew Mystery Stories #158, The Curse of the Black Cat, set in a fictional exclusive girl`s prep school on the East Coast. The game runs on Microsoft Windows and is rated E for everyone.