The Secret of the Old Clock (Nancy Drew Mystery Stories #1) by Carolyn Keene
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.
Dog Gone Note: This can be read as a stand alone despite being part of a series. This book is in excellent condition.