Binding tight, spine in good condition (a little shelf-wear bend at the bottom but not torn), pages are clean and tight. The book is quite readable and has only a penciled price mark on the cover page.
Madge arrives at Cheltham Bay to spend a few weeks with her friend, Enid Burnett, and her father on their yacht, The Flora. Much to Madge's surprise, no one meets her at the dock. Madge hires a man to row her out to the yacht which appears to be deserted. Madge finds that Mr. Burnett's room has been ransacked and then discovers Enid a prisoner in the closet. Enid reports that her father has been abducted by several men. A ransom note is found the next day, requesting that Enid deliver Mr. Burnett's Zudi Drum Bowl to a location approximately 50 miles up the coast. Madge and Enid wonder why the kidnappers want the bowl instead of money. Enid is determined to take the bowl to the requested meeting place, but Madge and Enid's friend, Rex Stewart, are unconvinced of the wiseness of the mission. They follow Enid on her journey so that they can help her if something goes wrong.
Madge's summer vacation has ended, and she is back in school. Madge and her friends initiate Cara Wayne into their secret society by requesting that Cara visit the spooky Swenster mansion at night. Cara comes back tremendously frightened because she saw a ghost digging on the property. While the other girls are skeptical, Madge feels that Cara did see something strange. Madge and Cara visit the Swenster mansion the next day and meet Agatha Swenster, who plans to sell the house. The girls quickly become friends with Miss Swenster and help her prepare the mansion and its contents for auction. The girls learn of a valuable pearl necklace that has been missing for years and how much its recovery would mean to Miss Swenster. The girls search for the pearl necklace and hope that they can recover it so that Miss Swenster does not have to sell the mansion.