From the introduction:
The characters have departed the port of Ghazor in a Merchant Ship, 'The Golden Prize', bound for the unknown jungle lands that lie beyond the Hills of the Dead and the dismal swamplands of the Cannibal Coast.
The owner of the vessel, Natam Daar, has determined to explore these uncharted jungle coasts and believes that there are riches there to be exploited by a man with a good ship and a fearless crew.
The ship is wrecked in a fierce storm and there are few survivors, most of whom are slain in a subsequent attack by fierce tribesmen clad in leopard skins and wielding wickedly curved daggers.
The characters find their way to a Zadjite Slaver Fortress. The local tribes folk are in revolt, having been stirred up by the cultists of the Leopard God and the characters find themselves under seige. To make matters worse, something terrible stalks the darkened halls of the citadel.