 In Southampton in 1916, HMHS "Britannic", a sister ship of the "Titanic", has been refitted as a hospital ship for Allied soldiers fighting in the Gallipoli Campaign.Among the nurses who are to serve aboard her is Lady Lewis (Jacqueline Bisset), who is being delivered to Greece via Naples, where her husband has become Ambassador for Great Britain.Traveling with her is Vera Campbell (Amanda Ryan), an operative of British Intelligence posing as Lady Lewis' governess.