'To that flash of semi-vision can be traced a full half of the horror which has ever since haunted us'An expedition to Antarctica goes horribly wrong as a group of explorers stumbles upon some mysterious ancient ruins, with devastating consequences.At the Mountains of Madness ranks among Lovecraft's most terrifying novellas, and is a firm favourite among fans of classic horror. The Penguin English Library - collectable general readers' editions of the best fiction in English, from the eighteenth century to the end of the Second World War.