Don Cadee Mystery #5 (1958)

During his eight years with the upscale Ambletts department store chain, Chief of Store Protection Don Cadee has developed a penchant for hiring operatives who have inside knowledge of the exact activities they're employed to guard against. One of Don's more recent projects is Andy Ryan. Andrea Reinholt, according to her rap sheet. Her resume includes having lifted a small fortune in posh frocks from Ambletts. Suitably rehabilitated from both her life of crime and her heroin habit, her well-heeled upbringing helps Andy blend in seamlessly among Ambletts' upper-crust clientele, and shoplifting incidents have been down since she started walking the floor. The only thing Andy steadfastly refused to do to redeem herself was rat out her confederates, but now it looks like her old gang may be setting up shop again.

And Andy Ryan poses an unacceptable business risk.