From publisher blurb:
Wrath of the Banshee Queen is a Fifth Edition adventure intended for three to five characters of 9th to 11th level and is optimized for four characters with an average party level (APL) of 10. A banshee queen holds a court of trapped spirits prisoner within her cursed castle deep in the swamps. The adventurers will be drawn into the spirits' horror-filled ghost stories, battle the enchanted furniture gone mad, and discover the truth behind the banshee queen's curse.
This adventure takes place in The DM Tool Chest's Bastion domain of dread setting that easily fits into any existing campaign. You can also easily change the names of the people and locations to place the adventure location into any setting that includes a ruined castle in a swamp.