I haven't written this up yet.
Should your players arrive here by accident, make things up as you go along, using the following as guidelines:
It's a Gothic Castle, just like in the horror films. The owner's name is Pamina (it is a common name - she is not this Pamina). She is neutral evil and does unpleasant things to guests for her own amusement and that of her henchmen.
Lady Pamina considers herself to be retired from adventuring since the death of the previous owner of the castle, her maternal grandfather. She would come out of retirement if the potential rewards of doing so appeared good enough. In particular, she wants a girdle of giant strength.
[AD&D-Specific] Lady Pamina, human female, height 5'11", weight 147 lb. Str 11 Dex 17 (Aim 17, Balance 18) Con 14 (Fitness 16, Health 12) Int 13 Wis 16 (Intuition 14, Willpower 18) Cha 12 (18 using ring of human influence) Align NE Hp 103. Fighter, level 17.
[AD&D-Specific] Kit: Swashbuckler. Restricted to chain mail or lighter, and to thief weapons. Followers, Increased Movement, Move Silently, Weapon Specialisation. Traits: Glibness, Keen Hearing, Music/Instrument.
Lady Pamina fights like a skilled warrior (which she is) but moves like a dancer. Her hobby (apart from killing people) is music: she plays several instruments very well.
[AD&D-Specific] Fighting style specialisations: one-handed weapon, two weapons.
[AD&D-Specific] Principal weapon: her grandfather's Darkblade: a +5 defender bastardsword, equivalent to a +5 defender sword and a (reversed) Sunblade, doing +10 damage vs good-aligned beings and double damage vs paladins. Darkness power (reversed sunray, affecting paladins and other holy types) once/day. This blade can, in principle, be used by any evil character proficient in either bastardsword or shortsword, but taking it off Lady Pamina will not be easy.
[AD&D-Specific] Second weapon: +4 shortsword. Armour: +4 chain mail Other equipment: Ring of human influence, Robe of blending, Evil-aligned bronze horn of valhalla, Drums of panic.
As a high-charisma landowner with a history of successful adventuring, Lady Pamina has several assorted henchmen as well as her fighter followers.
Lady Pamina and Meera the Transmuter are old adventuring companions and still meet from time to time to compare notes. Each would come to the other's aid in times of emergency.