Main heroine is Shelley Jensen, young smart girl. Member of WAAF (Women's Auxiliary Air Force) in 1940, during Battle of Britain. As member of WAAF, she usually work around airfields or high ranking RAF officers, not on front lines. Shelley is smart, strong willed, patriotic girl who enlisted to protect her country. She is bit naive and curious. Bit like Nancy Drew. Shelley has very basic military training but can be very resourceful especially in perils.