The famous detective is on the trail of a very special missing person case! Enola is still hiding in London from the world's greatest detective – her own brother Sherlock – and is waiting for more coded messages from her mother. When she accidentally learns about the missing Lady Cecily and recognizes a kindred spirit in her remaining drawings, Enola takes on the investigation. Incognito, she must be on guard against murderers and criminals on the dark streets of London while trying to decipher the clues. To save Lady Cecily, Enola risks more than she should – and unexpectedly gets closer to her brother in the process.