From publisher blurb:
Blue Moon is a short adventure designed for a party of five 3rd-level characters.
Hundreds of years ago, a holy warrior by the name of Madeleine led the armies of good to victory over an army of demons, witches, and monsters. Omens point to those powers rising again… and to them seeking Madeleine’s bones for some dark purpose.
The ruler of the region has called for a group of adventurers with no ties to the crown to discreetly retrieve Madeleine’s remains from their resting place, as a precaution. The cemetery where she is interred is accessible only rarely—the result of ancient magics laid down to keep her safe. If the adventurers don’t succeed tonight, the cemetery sinks back underwater, inaccessible to the living—but not to the forces of darkness—for a hundred years.
By default, the ruler is Queen Chana IV, a stern and capable warrior queen, and part of a dynasty that has ruled the region for almost a millennium. Adapt or substitute this character as appropriate for your campaign.
The characters have been hired by an agent of the crown to retrieve Madeleine’s bones from their resting place.
Alternatively, they have been hired by a power that opposes the monarch, or a group that wants to exploit the queen’s desperation, to obtain Madeleine’s bones and either keep them from the monarch’s grasp, or sell them to the queen at an extortionate price.