In a journey shrouded in mystery and intrigue, Sir John Franklin's 1845 campaign in search of the Northwest Passage ended in tragedy. All 129 men were lost to the ice, and nothing from the expedition was retrieved, including two rare and valuable Greenwich chronometers. When one of the chronometers appears a century and a half later in London, in pristine condition and crudely disguised as a Victorian carriage clock, new questions arise about what really happened on that expedition–and the fates of the men involved.