Day of doom The 39 Clues: Cahills vs. Vespers Series, Book 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, Amy and Dan discover Vesper One's terrifying endgame. The objects he demanded are vital pieces in a Vesper plot that will harm millions of innocent people. Now the two siblings and their friends are in an all-out sprint to stop Vesper One . . . before the whole world goes BOOM. The Ultimate Sacrifice 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, Amy And Dan Discover Vesper One’s Terrifying Endgame. The Objects He Demanded Are Vital Pieces In A Vesper Plot That Will Harm Millions Of Innocent People. Now The Two Siblings And Their Friends Are In An All-out Sprint To Stop Vesper One . . . Before The Whole World Goes Boom. After delivering the last ransom, Amy and Dan discover that Vesper One has a terrifying plot and they race against time to stop him from harming millions of innocent people