Still mourning the death of their mother, three brothers go with their father on an extended sailing trip off the Florida Keys and have a harrowing adventure at sea.

Sarah's dad and stepmon decide to take the whole family on a special vacation in order to break the ice and have everyone get to know one another. They'll fly to Tahiti, charter a boat, and go sailing for a few days. It'll be an adventure, right? Wrong. Dead wrong.

Jack and Annie are in for an exciting, scary, and sad adventure when the Magic Tree House whisks them back to the decks of the Titanic. Is there anything they can do to help the ill-fated ship? Will they be able to save anyone? Will they be able to save themselves?