** BBC Radio 4 Book of the Week **Shark Drunk is, in part, the tale of two men in a very small boat on the trail of a very big fish. It is also a story of obsession, enchantment and adventure. A love song to the sea, in all its mystery, hardship, wonder and life-giving majesty. In the great depths surrounding the remote Lofoten islands in Norway lives the Greenland shark. Twenty-six feet in length and weighing more than a tonne, it can live for 200 years.