Carolyn Keene

Boo! The Clue Crew is in for a fright! It's Halloween in River Heights! The girls can't wait to go trick-or- treating and are busy getting their costumes ready. They also can't wait for the Halloween special of their favorite TV show. They even get the chance to visit the TV studio while the show is being taped! But …

The Hidden Staircase is the second volume in the Nancy Drew Mystery Stories series written under the pseudonym Carolyn Keene, published in 1930 and revised in 1959.