Sheryl Holmes

"Elementary my dear Janey."
—Sheryl to Jane, using her father's famous catchphrase. 
Sheryl Holmes, portrayed by,  was the daughter of Irene Adler and Sherlock Holmes and Maya's younger cousin. Jane  became Sheryl's best friend through their fathers and have been solving crimes together ever since, but then Jane and Matthew Mavis start dating and Sheryl becomes lost without her friend until they talk to each other about theri friendship never going a way.