Nancy Drew: #21 Warnings at Waverly Academy

Warnings at Waverly Academy is the 21st installment in the Nancy Drew video game series created by Her Interactive. It is based on The Curse of the Black Cat, #158 in the Nancy Drew Mystery Stories series. It is located at a fictional exclusive girl's only prep school on the East Coast. Nancy Drew is called to go undercover as a student there, to find out who has been sending threatening messages to the valedictorian candidates. From Wikipedia