39 Clues: Into The Gauntlet, by Margaret Peterson Haddix

The last book in the 39 Clues series!
Satisfying conclusion to fantastic series- this one was set mostly in England and Ireland.

39 Clues: Storm Warning, by Linda Sue Park

Caribbean- Bahamas and Jamaica.

39 Clues: The Emperor's Code, by Gordon Korman

China.

39 Clues: The Viper's Nest, by Peter Lerangis

Indonesia.

39 Clues: In Too Deep, by Jude Watson

Australia.

39 Clues: The Black Circle, by Patrick Carman

Russia.

39 Clues: Beyond the Grave, by Jude Watson

Yup- 39 Clues, this one Egypt.

39 Clues: The Sword Thief, by Peter Lerangis

More action and adventure- Japan.

39 Clues: One False Note, by Gordon Korman

Amy, Dan and the rest of the Cahills on the Clue adventure- this one mostly in Vienna.

39 Clues: The Maze of Bones, by Rick Riordan

This was fantastic!!!!!!! I am literally aching to read the rest of the series. I don't know why it took me so long, I sent this to my nephews about 2 years ago, but didn't read one myself until yesterday!
The Cahill family, whose members have included just about every important historical figure, is divided into 4 branches, who are racing each other around the world to solve a set of 39 clues left by the family matriarch in her will. Excellent puzzles, history, setting- this one was Paris, and made me want to crawl around the Catacombs and climb Mont Martre on a stormy night- great (if briefly introduced) characters- this was a wonderful start to what I hope is a great series!