The "Big Four" served the White Star Line for 110 years and carried around 1.5 million passengers between Liverpool and New York. Arguably, they were the most successful series of ships the company ever produced, but have been entirely overlooked in maritime literature. Many features of the ships were trialled before their use on Olympic and Titanic and, in many ways, the "Big Four" can be seen as the forerunners of the famous "Olympic" class ships. Celtic met her end on the rocks off Ireland in 1928, and her sister ships fell into the red during the early 1930s. Mark Chirnside tells their stories in detail in this groundbreaking new book.