"The Black Cat curses you until the day you die".
Exclusive Waveryly Academy looks like a medieval castle, but the horrors there are up-to-date. The lead in the school play awakes with her long golden hair cut off, and the captain of the basketball team finds her lucky sneakers covered with tar. Each incident is accompanied by a curse note from the Black Cat, and soon everyone is spooked - even the teachers.
At the headmistress's request, Nancy and George go undercover as teaching interns. But it isn't long before Nancy herself gets one of the menacing notes. Who's behind the pranks - an unhappy student? Or is a more sinister force at work? Lured to a scary cemetery in the middle of a blizzard, Nancy must stop the Black Cat from pouncing again!