Bestselling author Jude Watson takes Amy and Dan on a thrill-packed ride for the 4th installment of The 39 Clues series. Betrayed by their cousins, abandoned by their uncle, and with only the slimmest hint to guide them, fourteen-year old Amy Cahill and her younger brother, Dan, rush off to Egypt on the hunt for 39 Clues that lead to a source of unimaginable power. But when they arrive, Amy and Dan get something completely unexpected - a message from their dead grandmother, Grace. Did Grace set out to help the two orphans . . . ore are Amy and Dan heading for the most devastating betrayal of them all? Jude Watson is the author of six 39 Clues books, Beyond the Grave, In Too Deep, Vespers Rising, A King's Ransom, Nowhere to Run, and Mission Titanic, along with the bestselling Star Wars: Last of the Jedi and Jedi Quest series. As Judy Blundell, she wrote What I Saw and How I Lied, the 2008 winner of The National Book Award for Young People's Literature. She lives in Long Island, New York, with her husband and daughter.