Title: The Medusa plot
Description: Are you ready to save the world? The bestselling series returns with an adventure spanning 6 explosive books, 2 secret-filled card packs, and a website that places readers right in the action.

Thirteen-year-old Dan Cahill and his older sister, Amy, thought they belonged to the world's most powerful family. They thought the hunt for 39 Clues leading to the source of that power was over. They even thought they'd won. But Amy and Dan were wrong.

One by one, distress calls start coming in from around the globe. Cahills are being kidnapped by a shadowy group known only as the Vespers. Now Amy and Dan have only days to fulfill a bizarre ransom request or their captured friends will start dying. Amy and Dan don't know what the Vespers want or how to stop them. Only one thing is clear. The Vespers are playing to win, and if they get their hands on the Clues . . . the world will be their next hostage.
Subjects: Code and cipher stories, Juvenile fiction, Kidnapping, Brothers and sisters, New York Times bestseller, nyt:series_books=2010-05-01, Families, Orphans, Fiction, Genealogy, Adventure and adventurers, Ciphers, Good and evil, Children's fiction, Kidnapping, fiction, Orphans, fiction, Brothers and sisters, fiction, Good and evil, fiction, Cryptography, Family life, Mystery and detective stories
Places: Tel Aviv
People: Dan Cahill, Damien Vesper, Amy Cahill
Time periods: 2011, Cahills vs. Vespers, The clue hunt, the 39 clues