Enola Holmes is in charge. Double disappearance

Enola Holmes, the younger sister of the famous detective Sherlock Holmes, lives in a country house with her mother until she is 14 years old. But it is on the girl's birthday that her mother mysteriously disappears. So the brothers decide to send their sister to a boarding school…
Arbitrary Enola flees to London to find her mother. However, he stumbles upon the mysterious case of kidnapping the young marquis and immediately begins an investigation.
What awaits a young girl in a big dangerous city and will she succeed in her new independent life?
For middle school children.