39 Clues Series

1. The Maze of Bones - by Rick Riordan
2. One False Note - by Gordon Korman
3. The Sword Thief - by Peter Lerangis
4. Beyond the Grave - by Jude Watson
5. The Black Circle - by Patrick Carman
6. In Too Deep - by Jude Watson
7. The Viper's Nest - by Peter Lerangis
8. The Emperor's Code - by Gordon Korman
9. Storm Warning - by Linda Sue Park
10. Into the Gauntlet - by Margaret Peterson Haddix
11. Vespers Rising - by Rick Riordan

• Black Book of Buried Secrets - by Mallory Kass

Cahill Files

1. Operation Trinity - by Clifford Riley
2. Spymasters - by Clifford Riley

Cahills vs. Vespers

1. The Medusa Plot - by Gordan Korman
2. A King's Ransom - by Jude Watson
3. The Dead of Night - by Peter Lerangis
4. Shatterproof - by Roland Smith
5. Trust No One - by Linda Sue Park
6. Day of Doom - by David Baldacci

Doublecross

1. Mission Titanic - by Jude Watson
2. Mission Hindenburg - by Alexander London
3. Mission Hurricane - by Jenny Goebel
4. Mission Atomic - by Sarwat Chadda

Unstoppable

1. Nowhere to Run - by Jude Watson
2. Breakaway - by Jeff Hirsche
3. Countdown - by Natalie Standiford
4. Flashpoint - by Gordon Korman