Edgar Wallace 
Kate Plus Ten 

This is the story of a young female criminal mastermind who leads a gang in a series of exceptionally daring and very profitable robberies but works as secretary to keep her cover story intact. When she picks up information from her boss, an aristocrat, the police soon suspect her of wrongdoing. But she meets a handsome police officer who very much against her will softens her hearts. She and the gang become alienated from one another. Naturally she just has something in her system, which eventually is found to be eradicable, as you will discover when you reach the end of this exciting book.