The Additional Books in the Series are Agent Handbook, The Black Book of Buried Secrets, and The Cahill Files.The Black Book of Buried Secrets is an informative book discussing clue hunters and the branches. The Agent Handbook gives a bit of information abou teach branch and some codes. Other additional books include Rapid Fire (seven short e-books released from December 25 to December 31 about the Cahills during and after the Clue Hunt) and Cahill Files (four short e-books about certain Cahills in history), both written by Clifford Riley.

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