Carolyn Keene

The Greek Symbol Mystery is the 60th volume in the Nancy Drew Stories series.

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 …

Mr. Drew is on the trail of an international ring of jewel thieves and asks Nancy to assist him. The trail leads to a summer resort area. Before Nancy has a chance to start work on her father’s case, a golf caddy tells her a frightening tale--in the dense woods nearby is an old wooden footbridge guarded by a ghost! …

Bess and George invite Nancy on a trip to New Orleans, to help their relatives solve a mystery. Their uncle wants to restore an old showboat, the River Princess, but no one will go near it! Mysterious occurrences are making everything believe the boat is haunted. Can Nancy uncover the truth?

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.