Day of Doom (The 39 Clues: Cahills vs. Vespers: Series #6)

International bestseller David Baldacci pens the stunning conclusion to Cahills vs. Vespers!

It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series of bizarre ransoms from around the world. Thirteen-year-old Dan Cahill and his older sister, Amy, began a global treasure hunt, determined to bring back whatever Vesper One needed, so long as it kept the hostages safe.But when they deliver the last ransom, A...