Translated from the back of the book:
"'The City of the Dead Monarch'
In times immemorial a mighty dynasty ruled in the swamps near Selem. Since the truly powerful find no rest even in death, brave fighters are needed to protect the living from the terrors of the past."
Additional user information (contains spoilers)
In this adventure module the heroes venture back in time to an era when the world was ruled by a dynasty of lizard men, investigating the burial ceremony of a lizard king who haunts their present as an undead.