Game #11 in the Nancy Drew Adventure series.
From the publishers website:
All is not well in Blackmoor Manor, a Fourteenth Century English mansion haunted by a tragic past. You, as Nancy Drew®, embark on your first international adventure to visit Linda Penvellyn, your neighbor's daughter and newlywed wife of a British diplomat. A mysterious malady keeps Linda hidden behind thick bed curtains. Is she hiding from something or someone, or is a more menacing threat stalking her? Face your fears to find the truth!
Blackmoor Manor is a centuries-old mansion located in the moors of England. It is the ancestral home to the Penvellyn family, an old, eclectic family with a long history of fascinating ancestors.
Something sinister lurks beyond these creaking gates! Gather your courage to delve into dark legends lurking in the shadows of an old English mansion.