The 39 Clues: Cahills vs. Vespers (Spin-Off)

Book 1

The Medusa Plot

Gordon Korman

Book 2

A King's Ransom

Jude Watson

Book 3

The Dead of Night

Peter Lerangis

Book 4

Shatterproof

Roland Smith

Book 5

Trust No One

Linda Sue Park

Book 6

Day of Doom

David Baldacci