When the United States joined the Allies after the German declaration of war in December 1941, Summersby was one of many MTC drivers assigned as chauffeurs to high-ranking American military officers. She drove an ambulance throughout the London Blitz in 19, and was reportedly excellent at navigating London streets during blackouts and fog. When Britain entered the Second World War in 1939, Summersby joined the British Mechanised Transport Corps (MTC). She was married and divorced, retaining the name of her ex-husband. As a young woman, she moved to London where she worked as a film studio extra, dabbled in photography, and eventually became a fashion model. Colonel of the Royal Munster Fusiliers, as black Irish and her mother as English. and Vera MacCarthy-Morrogh her father was originally from County Kerry, and her mother was born in Wales. Summersby was born Kathleen Helen MacCarthy-Morrogh in Ballydehob, County Cork, Ireland. Some later writers suggest there were sexual relations between the two, but a number of the people who knew both of them at the time have denied it, as have several scholars. It is generally agreed that Summersby and Eisenhower became extremely close during the war. They were together a great deal until the war ended, when Eisenhower cut his ties and returned to the United States.

Kay Summersby (1908 – 20 January 1975 ) was a member of the British Mechanised Transport Corps during World War II, who served as chauffeur to Supreme Commander Allied Expeditionary Force Dwight D.

Mistress of Light by K.T. Kaye