Winter Holiday (Swallows and Amazons Series #4)

The fourth book in Arthur Ransome's classic series for children, winter holiday takes intrepid explorers John, Susan, Titty, and Roger Walker, and fearsome Amazon pirates Nancy and Peggy Blackett to the North Pole. Joined by budding novelist Dorothea Callum and her scientist brother Dick, the children plan an "Arctic" expedition. But unforeseen events separate the travelers and disaster nearly strikes in the exciting climax of their race to the Pole.