Brothers Brian and Joe Hackett and wife Helen attempt to run a Nantucket-based airline while surrounded by their various wacky friends and employees.
Joe and Brian are divided over their new-found inheritance: Joe wants to expand the business, and Brian wants the money to leave Nantucket and the tedium of his job. Joe's agony over the dissolving of the partnership is further complicated when he learns of Helen's earth shaking news: she's been invited to study cello in Vienna with the world's greatest cellist. Joe is prepared to sacrifice Sandpiper to help Helen finally live her dream. But it is Brian who makes the final sacrifice, by postponing his and Casey's move to the Carribean, in order to run Sandpiper for one year while Joe and Helen are away in Vienna.
To cheer up Helen, Joe restores her old cello. While Helen is busy rediscovering her old passion, Joe and Brian discover the ages old treasure hunt they undertook when their father died isn't over yet. They and the rest of the gang are led all over New England, only to wind up back at the airport, to discover $250,000 in an old suitcase in an airport locker.