On the Case with Holmes and Watson: Case 12: Sherlock Holmes and the Adventure of the Cardboard Box
- Publisher: Lerner Publishing Group
- Written By: Sir Arthur Conan Doyle
- Art By: Sophie Rohrbach; JT Morrow
- Language: English
- Digital Release Date: June 3rd, 2020
When Miss Susan Cushing receives a package with gruesome contents, she cannot imagine who sent it. While Inspector Lestrade dismisses the package as a practical joke, Holmes fears the worst. Can Holmes and Watson discover the sender?