I got this from the 39 clues wiki-
A King's Ransom will be the second book in the Cahills vs. Vespers series, and will be released December 6, 2011.Cover Messages On the bottom left space of the statue you can see the words, "Find Stan", possibly suffering to Uzbekistan Somewhere near the bottom of the statue you can see an outline of a country called Uzbekistan Instead of the Nazi Swastika, there is a V for Vespers underneath the eagle. Description From Amazon.com
Amy and Dan are in a race for their lives . . . and the enemy may be even closer than they think.
When seven members of their family were kidnapped by a sinister organization known as the Vespers, thirteen-year-old Dan Cahill and his older sister, Amy, vowed they'd stop at nothing to bring the hostages home. But then the ransom comes in and the Vespers demand the impossible. Amy and Dan have just days to track down and steal an ancient map. The only catch? No one has seen the map for half a century.
Now Amy and Dan are on a desperate search that will lead them to the Nazis, spies, a mad king and some of history's dirtiest secrets. It's the race of their lives . . . and one mis-step will mean certain death for the hostages.
So yes, it sounds like Amy and Dan will be going to Uzbekistan. But that's not all. Notice at the bottom left part of the cover the constellation "Lupus." Well, I did a little research and found this-
Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY
Caption: Lupus constellation. 17th century engraving of Lupus (the Wolf), overlaid with the positions of the stars that make up this constellation. The wolf is being killed by a spear wielded by a centaur (right, the constellation Centaurus). This star map is from Uranometria, a star atlas published in 1603 by the German astronomer Johann Bayer. It contained a total of 51 star maps, plotted using the most accurate observations of the time. It was the first star atlas to use reference grids on its maps, and the first to use Greek letters to identify individual stars, though it retained the traditional mythological depictions of the constellations.
Well, well, well. I believe in the summary for A King's Ransom, it says that Amy and Dan have to find a map that hasn't been seen in half a century. I think 1603 is close enough, hmm? Uranometria was published by the German astronomer Johann Bayer...and it also says in the summary that there are Nazis in the book...it all fits! So it sounds like they'll be looking for a map of Lupus from Uranometria...wonder why the Vespers want it...hmm.