Adventure Title
Jewel/Gem/Amulet of (the) Skull/Bone

Alternate title
Ghost/Spirit/Specter of the Citadel/Castle/Fortress

Opening Scene
A hidden temple that is Obscure where they encounter Natives that is/are Unfriendly

Plot hook and draw
An anonymous letter that is/has Funded an expedition

Plot Concept
A secret coup that is motivated by To strike first

Primary Antagonist
A pirate king or queen who/that is Maniacal

Plot fulfillment and location
An ancient text from Mount Yimsha