ON BECOMING AN INVESTIGATOR contains valuable tips that can help your investigator reach middle age, and possibly even to those golden years. THE OCCUPATIONS SECTION contains 140 different possible 1920s occupations for CALL OF CTHULHU investigators « perfect for replacing that dearly-departed friend on-the-spot with the bartender or cabbie who witnessed the whole gruesome affair. 1920s SKILLS expands upon skills descriptions found in the 5th edition of CALL OF CTHULHU, including additional material regarding the Roaring Twenties. APPENDIX A contains legal tips for the professional investigator. APPENDIX B describes the current state of science and forensics. An essential aid for players, investigators, and keepers.