Other editions of book The Sign of Four

How often have I said to you that when you have eliminated the impossible whatever remains, however improbable, must be the truth?Book #2 of 8 in the Sherlock CollectionThe greatest detective duo is back and they have taken a case from Mary Morstan, whose father has gone missing ten years earlier after he had returned from India. The case isn’t as simple as a missing person, however. Starting six years ago, Mary had begun to receive a single pearl every year, and with the last pearl, a request for a meeting was attached to the gift. Coincidentally, it seems Mary’s father had a friend from his regiment named Major Sholto who had died at near the same time Mary began receiving her annual pearl. Together, Holmes, Watson, and Mary set off to meet the anonymous sender of the pearls, and thus begins the second mystery in the Sherlock literary canon.