Nancy determines whether an exquisite ivory elephant charm really protects its wearer from harm during her investigation of a circus performer who may be involved in a mysterious illegal scheme. The girl detective’s assignment becomes complicated when the elephant trainer’s young assistant seeks refuge at the Drew home from his cruel foster father. While following clues to help the boy find his real father, Nancy discovers an eerie abandoned house. As she probes, Nancy’s dangerous enemies thwart her efforts to discover a secret surrounding the unusual ivory charm. This book is the revised text. The plot of the original story (©1936) is similar with minor revisions.