Book excerpt: How to become an Undercover Pirate... 1)Have a pirate captain as your ancient ancestor 2)Find a message in a bottle and a magic gold doubloon 3)Get whisked back in time to join a pirate crew 4)When you get home DON'T TELL ANYONE. Remember - you're undercover! When Sam Silver and the crew of the Sea Wolf board a galleon looking for Spanish gold, they find it's already been stolen - by a ghost ship! Can our pirate heroes outwit a ghostly crew or is the treasure gone for ever?