Enola Holmes, much younger sister of detective Sherlock Holmes, must travel to London in disguise to unravel the disappearance of her missing mother.

Enola Holmes, Sherlock Holmes's younger sister and self-declared finder of lost persons and things, is determined to find her friend, Lady Cecily, a confused young Baronet's daughter on the run from her father's devious schemes.

In late nineteenth-century London, fourteen-year-old Enola Holmes, much younger sister of detective Sherlock Holmes, turns to Florence Nightingale for help when her investigation into the disappearance of a Crimean War widow grows cold.

"Enola is still hiding from Sherlock and her other brother Mycroft, who want to place her in a boarding school since their mother's disappearance. Looking for a new disguise, she finds just what she needs in a theatrical costume shop. This time, no old woman or ingenious girl will do as she transforms herself into an elegant and refined lady. When she questions Mrs. Watson about her husband's disappearance, Enola notices a strange bouquet. It is here...