2012 · ソースブック（プレイを拡張するルール／オプション）
The Investigator
This roleplaying supplement presents investigators as characters who solve problems through observation, research, deduction, and scientific knowledge rather than brute force. It supports modern or near-modern heroes transported into fantasy settings and explores how their education and technology interact with a more primitive world. The supplement also provides guidance for running mystery adventures, including gathering clues, handling failed rolls without halting an investigation, avoiding investigations that overwhelm a campaign, and using advanced scientific knowledge. Rules for Progress Levels help define the technological development of the setting.
スキルベース（スキルを購入または獲得）属性／ステータス制（STR、CON、PERなど）レベル制（XPを獲得してレベルアップ）
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。