What was the original mystery the Sherlock Society Detective Agency tried to solve?

• A. Where Al Capone's treasure was located
• B. The secret of the Coconut Grove lighthouse
• C. The mystery of the missing museum exhibit
• D. The case of the vanishing library books

Answer: (A)

The key idea here is identifying the first case that launched the Sherlock Society Detective Agency. The earliest mystery they tackled was the search for Al Capone’s treasure, a legendary stash rumored to be hidden somewhere. This makes it the best answer because it matches the story’s origin story—the case that started their adventures and set the tone for what they chase. The other scenarios—like a lighthouse secret, a missing museum exhibit, or vanishing library books—are interesting possibilities, but they do not correspond to the initial case that began the agency’s detective work.