Nancy Drew Mystery Stories: The Secret of the Old Clock/ The Hidden Staircase

The Secret of the Old Clock-Nancy, unaided, seeks to find a missing will. To the surprise of many, the Topham family will inherit wealthy Josiah Crowley's fortune, instead of deserving relatives and friends who were promised inheritances. Nancy determines that a clue to a second will might be found in an old clock Mr. Crowley had owned and she seeks to find the timepiece. Her search not only tests her keen mind, but also leads her into a thrilling adventure.
The Hidden Staircase-After receiving a call from her friend Helen Corning, Nancy agrees to help solve a baffling mystery. Helen's Aunt Rosemary has been living with her mother at the old family mansion, and they have noticed many strange things. They have heard music, thumps, and creaking noises at night, and seen eerie shadows on the walls. Could the house be haunted?