The Medusa Plot (The 39 Clues: Cahills vs Vespers), by Gordon Corman.
The hunt for the 39 Clues is over, and thirteen-year-old Dan Cahill and his older sister, Amy, are resigning themselves to life as ordinary kids. But, in as much as they belong to the most powerful, most wealthy family in the world, ordinary isn't really an achievable goal. Especially when a rival family, the Vespers, launches an attack against them--an attack that begins with a mass kidnapping. Dan and Amy are lucky to have foiled the attach on them--others of their Cahill family peers aren't as lucky. Now those unlucky ones are being held hostage--and Amy and Dan find themselves dancing to the very dangerous tune of the Vespers.
For the Vespers are using Dan and Amy as their tools in a deadly game of illegal art theft--looking for clues that lead to an unknown destination, where they might (or might not) be able to win the release of the hostages!!!!!
Or maybe just one exclaimation mark would do.
Still, it's all very exciting and tense, and great for those who like Adventure and Action, and I imagine that it would be much More So for those who have actually read all the 39 Clues books and know all the characters so much better than I do! Even without that background knowledge, though, I enjoyed it all just fine for what it was. I was curious about the twist of the plot, and was even (in a mild sort of way) interested in the characters qua characters, but more to the point, I don't see why my picky reader son won't just sit down and read this series for crying out loud.
(ARC received at Book Expo America)