When Enola Holmes-Sherlock's teen sister-discovers her mother missing, she sets off to find her, becoming a super-sleuth in her own right as she outwits her famous brother and unravels a dangerous conspiracy around a mysterious young Lord.
While trying to make his sister's wedding day go smoothly, Jack finds himself juggling an angry ex-girlfriend, an uninvited guest with a secret, a misplaced sleep sedative, and the girl that got away in alternate versions of the same day.