When David finds himself aboard a pirate ship, he knows it must be a dream. Except that he's awake. And the 'dream' is more like a nightmare. Before he can take it all in, David is swept up in the adventure of a lifetime: volunteered to act as a spy on an enemy ship, marooned, and picked up by the most fearsome band of buccaneers ever known. Can he escape? The answer lies in the golden thread glistening under the sea - and everyone is desparate to have it. Could it lead David home, or to his missing father - or both?