Storm Warning is the ninth book in The 39 Clues series. It is written by Linda Sue Park and was released on May 25, 2010.The geographical coordinates that appear on the ship on the book's cover (18 degrees, 15 minutes north; 77 degrees, 30 minutes west) indicate a point about six kilometers southeast of Albert Town, Jamaica.
As they were leaving China, Amy and Dan get a call from the Holts telling them that they knew where they were going. So Dan and Amy assume Nellie Gomez, their au pair, told the Holts.
On the plane, Dan and Amy get Nellie to give them some information. It turns out it wasn't Beatrice who hired her, Grace did. Nellie also tells them that she works for McIntyre, but does not tell them that she really works for the Man in Black.