As a dense yellow fog swirls through the streets of London a deep melancholy has descended on Sherlock Holmes who sits in a cocaine-induced haze at 221B Baker Street His mood is only lifted by a visit from a beautiful but distressed young woman
- Mary Morstan whose father vanished ten years before Four years later she began to receive an exquisite gift every year a large lustrous pearl Now she has had an intriguing invitation to meet her unknown benefactor & urges Holmes & Watson to accompany her & in the ensuing investigation
- which involves a wronged woman a stolen hoard of Indian treasure a wooden-legged ruffian a helpful dog & a love affair
- even the jaded Holmes is moved to exclaim ' Isn't it gorgeous!'