Attractive, intelligent and ruthless Eve Loxton heads the female section of the Department of Special Security [DOSS].
Constantly aiming to raise the profile of women within the department, she uses unorthodox methods to overcome DOSS's shoestring budget.
In September 1948 a case of espionage throws up the name of Fay Galbraith, an old enemy of Eve's.
Surveillance of Fay leads Eve's women to focus upon Jack Randall, Fay's colleague and on-off lover.