Since her father disappeared ten years ago, Mary has received annually and anonymously a pearl. When she is finally requested to meet the sender she is accompanied by Holmes and Watson. The stranger relates to them a tale of secrecy, hidden treasure and sudden death.
- ISBN10 0345247159
- ISBN13 9780345247155
- Publish Date 12 April 1975 (first published 1 February 1890)
- Publish Status Out of Print
- Out of Print 13 March 2021
- Imprint Ballantine Books
- Format Paperback (US Mass Market)
- Language English