Enola Holmes discovers that her friend Lady Cecily Alastair is in need of help. Twice before, Enola has rescued Lady Cecily from the sinister schemes of her father, Sir Eustace Alastair. And when Enola is brusquely turned away at the door of the Alastair home it soon becomes apparent that something is awry.

After a daring escape involving bows, arrows and prickly bushes, Enola quickly discovers she is not the only person trying to rescue Lady Cecily. Sherlock Holmes, the world-famous detective, is also on the case. Unfortunately, the girl has already disappeared again, and is now on the loose in the unforgiving city of London.

Will Enola and Sherlock work together to save Cecily? And can they agree on what they are saving her from?