Enola Holmes and lady with a lamp (#5)

Enola Holmes has not yet been in such a confusing situation. She should at the same time reveal the secret of the lady, who for many years, shut up in her bedroom, to find the kidnapper of the elderly owner of the boarding house, to unravel the secret of the son of the deceased Lord - and also understand that she tied all these people more than thirty years ago. And the key to everything is embroidery on an old blue dress...