England in the mid 1950s is not the same as it was. The powers that be have instituted...some changes. The League of Extraordinary Gentlemen have been disbanded and disavowed, and the country is under the control of an iron-fisted regime. Now, after many years, the still youthful Mina Murray and a rejuvenated Allan Quatermain return and are in search of some answers. Answers that can only be found in a book buried deep in the vaults of their old headquarters, a book that holds the key to the hidden history of the League throughout the ages: The Black Dossier. As Allan and Mina delve into the details of their precursors, some dating back centuries, they must elude their dangerous pursuers who are Hell-bent on retrieving the lost manuscript... and ending the League once and for all.