The 39 Clues - Series One: The 39 Clues - Book 9: Storm Warning

Book 9: Storm Warning

Storm Warning, by Linda Sue Park, was released May 25, 2010. Amy and Dan continue their hunt in the Bahamas and Jamaica. They distrust Nellie after discovering that she worked for William McIntyre. After that, they head out to the Port Royal excavation site with Lester, Miss Alice's grandson, and find a box Grace donated that can fit the objects they collected: the Ekat dragon necklace, the Lucian snake nose-ring, the Janus Wolf Fang, and the Tomas Bear Claw. However, they cannot open the box, and after a non-Cahill ally dies, the siblings decide to quit the hunt and return to their Aunt Beatrice. However, instead of driving them to the airport, Nellie stops at Moore town, and gives the box to the Man In Black, an ominous figure who has been following Dan and Amy. The Man In Black gives the siblings one hour to open the box. As he walks away, he says that in the game all sides are one and all are needed to survive. After many tries, they figure out that on the strip they found is an unfolded möbius strip. Amy inserts the strip to the final slit and the box springs open. It contains a poem by Madeleine Cahill, and the clue, Mace.

The Man In Black reveals his true identity as Fiske Cahill, Amy and Dan's great-uncle and Grace's younger brother, and tells them about Madeleine Cahill and the Madrigal branch, as well as granting the two active Madrigal status. He then also gives Nellie active Madrigal status even though she is not a Cahill. After reading the poem, Dan concludes the siblings' next stop is England. There, they must finish the clue hunt and stop the other branches from fighting, as per their new status as active Madrigals.