The 39 Clues #1-11 (set of 11 Used Paperbacks/Hardcover) - Rick Riordan

The 39 Clues - 1-11 Book Set 

The Maze of Bones - used paperback
 One False Note - used paperback
 The Sword Thief - used paperback
Beyond The Grave - used paperback
The Black Circle - used paperback
In Too Deep - used paperback
The Viper's Nest - used paperback
The Emperor's Code - used paperback
Storm Warning - used paperback
 Into the Gauntlet -used paperback
Vespers Rising - used hardcover

Scholastic Inc 2011
Good Condition - pages are clean and unmarked.  Covers have some wear from use