Moonmist (1986) by Stu Galley and Jim Lawrence.
As described on the box:
In Moonmist, you are a famous young American detective. An old friend, Tamara Lynd, has written you a letter (included in the package), asking for your help. And so you have travelled to England to test your detective skills.
As the story begins, you are outside Tresyllian Castle - the old, dark, hauntingly beautiful castle where Tamara now lives. Tamara greets you, and you meet some interesting guests. But your visit soon turns to mystery, as a trail of riddles and clues leads you to a hidden valuable treasure.
But Tamara is worried about a ghost that is tormenting her. What does the ghost want? Is it jealous of her? Does the ghost want the hidden treasure for itself? Or is the ghost a fake - just someone dressing up to frighten Tamara? If so, why?
PDF file of scanned original game manual.
Box art and description, specifications, and sample transcript.
Description, credits, box art, technical specifications, trivia.
Text of game announcement from Infocom's newsletter.
High-quality scans of packaging, manual, letters, visitor's guide, and iron-on.
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