It was in early January 1885 when Holmes and Watson were first embroiled in the question of Lady Abernatty's possible murder. A Junoesque, stylish woman visits the pair out of sheer fear for her stepmother's well-being. Mabel Bertram has always remained a great friend of her stepmother, until one day completely unexpectedly Lady Abernatty stops speaking to her and refuses to see her altogether.
Lady Abernatty lives on Grosvenor Square with her two children, Charles and Sabina, who have looked after their mother for years, her formidable manner having driven any potential suitors or lady friends away. It would seem they are servants more than children to her.
A costumed Holmes befriends Charles and Sabina to uncover the reason why their mother refuses to see her dear friend and stepdaughter Mabel.