
A routine holiday for Grandfather and his canine sidekick Roo turns into an adventure when the two join an expedition to find the Door to the Sea.
Sailing aboard the good ship Unsinkable, the intrepid explorers endure high waves, tall tales, and deteriorating table manners...

On holiday in Saltbottle, Grandfather and Roo discover the Unsinkable, the boat which took them to the North Pole in the first book, lying in a sadly dilapidated state and up for sale. At the auction, the short-sighted auctioneer accidentally sellsthe boat to Roo - sold to the...