The HM Bark Endeavour is sailing to Tahiti to map the transit of Venus, but there are rumours that once the task is completed, Lieutenant James Cook has a set of secret orders—orders that command him to search for the Great South Land. Isaac is twelve and has joined the crew of the Endeavour as a master's servant, good for scrubbing decks and not much else. He's certainly not considered good enough to fetch hay for the goat who will provide fresh milk for Cook and his officers. And this goat even has more experience at sea than Isaac—she has already sailed around the world once, watching the ocean and lands slip by from her spot on the quarterdeck. Over the months on board the Endeavour, a friendship grows between the goat and Isaac, one that will last through shipwreck, bushfire and illness. A friendship that helps in the discovery of exotic new lands...