"When Enola Holmes, sister to the detective Sherlock Holmes, discovers her mother has disappeared, she quickly embarks on a journey to London in search of her. But nothing can prepare her for what awaits. Because when she arrives, she finds herself involved in the kidnapping of a young marquess, fleeing murderous villains, and trying to elude her shrewd older brothers - all while attempting to piece together clues to her mother's strange disappearance....

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