| Mary Watson |
|Family|| Arthur Morstan, father|
John Watson, husband
|Appearances||The Sign of the Four|
Mary Watson, née Morstan is the wife of Dr. John Watson. She is first introduced in The Sign of Four and Watson refers to her in a number of of the stories. While she is generally not involved in the main action of most stories, she is a central character in The Sign of Four.
Mary's father, a senior captian of an Indian regiment and later stationed near the Andaman Falls, disappeared mysteriously in 1878 which would prove to be related to the mystery in The Sign of Four. Mary Morstan is Holmes' client in this story, and Watson describes her at their first meeting this way:
"She was blonde young lady, small, dainty, well gloved, and dressed in the most perfect taste. Her face had neither regularity of feature nor beauty of complexion, but her expression was sweet and amiable, and her large blue eyes were singularly spiritual and sympathetic."
Watson and Morstan fall in love during the course of the story. Watson initially hides his feelings for Morstan because she stands to inherit a fortune, and he sees it as improper and unethical to court her in view of her financial prospects. When the treasure is lost, they both admit feelings of relief and confess their love for each other.
She is rarely found in spin-offs of the Sherlock Holmes series. She is, however, a character in the Guy Ritchie films, Sherlock Holmes and its sequel, Sherlock Holmes: A Game of Shadows, where she is portrayed by actress Kelly Reilly.