More ghosts haunt the misty seacoast and stone ramparts of Cornwall than anyplace else on earth. One such soul roams Tresyllian Castle: a pale phantom with flaxen hair and a luminous, flowing gown. It seems like a fanciful legend... until the spectral "White Lady" threatens the life of your friend Tamara!
Arriving at the fog-shrouded castle, you meet a cast of eccentric characters ranging from a blue-blood debutante to an overly helpful butler. Has one of them donned the ghostly guise of the White Lady? Or has the drowned lover of Lord Jack, Tamara's fiancé, returned to haunt her successor? Perhaps the spectre is seeking the valuable treasure hidden somewhere in the lavish rooms and secret passageways of the castle. The solution to the mystery, as well as the location of the treasure, changes in each of the four variations of MOONMIST.