August 2004. As Hurricane Charley looms in the Caribbean, felon Travis Gahl escapes Belle Glade prison, fleeing across the state to the secluded islands of Florida’s Gulf Coast. In the emerald waters off Sanibel Island, two couples vacation on their catamaran Sabre. With wanton tensions between the foursome already high, they bring Travis aboard, who presents as an attractive and charming rogue castaway. However, Travis’s seemingly amiable presence only increases the strain between the parties.

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Distracted and led astray by their new arrival, the group learn too late they are directly in the path of a fast-approaching storm, and Travis is clearly not who he appears to be. As Charley makes landfall as a Category 4 hurricane a treasure hidden for almost 400 years is unearthed from beneath the sands of Cayo Costa. Arriving on the isolated barrier island after the storm, park ranger Teresa Randall finds herself in a desperate battle to survive, faced with a decision that will change her life—and the history books—forever . . .