Conceived as an invincible defence against enemy commerce raiders, the battlecruiser was hailed as a triumph. Designed to outrun and outshoot its opponents, its weakness was exposed at the Battle of Jutland: the armour could be pierced by a single enemy shell. At the outbreak of World War II, only four remain. In 1943, when Captain Guy Sherbrooke joins HMS Reliant, he knows he may be her last captain. As Britain prepares to invade occupied Europe she must enter the conflagration. And Sherbrooke cannot alter the bitter truth: only death or glory awaits HMS Reliant.