The Sealed Message (UNABRIDGED‪)‬

A mysterious message on a record is found sealed in a cylinder. A heroine straight out of a fairy-tale is kept secluded by a guardian with questionable motives. Add a murder, a gallant and fearless hero to the rescue and you have all the ingredients necessary to make this a very entertaining little mystery by acclaimed British author Fergus Hume! - Summary by Celine Major