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 Intrigued by the caddy's story, Nancy decides to investigate. Several riddles confront the young detective as she attempts to solve the mystery of the haunted bridge and track down a woman suspected of being a key member of the gang of jewel thieves.