'Now!' he snapped urgently. 'Down to the boat. As soon as you hear the engine start, jump in and get out of sight!'

Zoe and Bertram have embarked on the most amazing adventure of their lives. Egged on by the lively young mongrel Jack, they are escaping heir dull, shorebound lives and are on course for the remote island of Clany.

But what sort of life can the stowaways expect? Winter is coming, and food and drink will be hard to find on the island.