Case of the document changer -- Learning the secrets of document forgery -- Inspector's casebook -- Case #1. the case of the president's signature -- Case #2. the case of the deadly message label -- Case #3. the case of the implicating impression -- Case #4. the case of the signature that was not real -- Case #5. the case of the Windsor note -- Case #6. the case of the questioned photocopy -- Case #7. the case of the paper crease -- Case #8. the case of the misdirected tax payment -- Case #9 the case of the wizard and his pen -- Case #10. the case of the questioned page -- Investigating the crime -- Project analysis.