When Vincent Van Ghoul is put in charge of putting on the play about Crystal Cove's history, he panics and begs our Mystery Inc. gang to help him. The subject of the play? The Franciscan Friars that originally settled Crystal Cove and how their pet miniature donkey El Corto saved them all from destruction when the town slide into the sea some three centuries ago. As part of the historic play, celebration and exhibit, all sorts of artifacts have been put on display in City Hall…including the mummy of the last Friar to survive from the Fraternitas Mysterium (the Brothers of Mystery that searched for the Planispheric Disc and the fabled cursed treasure of Crystal Cove). This mummy comes alive and starts terrorizing the gang. But, it's not a real mummy. It's George Avocados in a suit. He's now the janitor at City Hall and is searching for the long-lost diamond that his father stole all those years ago. It's part of the costume jewelry on loan for the exhibit.
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