Acclaimed author and whale-watcher Philip Hoare takes us into the world of Arctic whales. From the whaling port of Whitby, we follow the historical trail of the whale hunters to the frozen seas of the North Pole and the worlds strangest whales - the bowhead, nearly hunted to extinction and now known to be the longest-lived mammal; the white beluga whale, so-called canary of the sea; and the tusked narwhal, whose existence gave rise to the legend of the unicorn.