Clifford Riley

Series

• 
  The 39 Clues: The Cahill Files series 5 books Starts with Operation Trinity →
• Legacy
  The 39 Clues: Rapid Fire series 7 books Starts with Legacy →

Other books

1. The 39 Clues: Midnight Ride The 39 Clues: Midnight Ride 2013
2. The 39 Clues: The Cahill Files: Spymasters The 39 Clues: The Cahill Files: Spymasters 2013

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8. Natalie Standiford Countdown