An all-female detective agency acts as a front for a government security operation, dealing with various crimes from theft to espionage under the leadership of ex-cop Maggie Forbes.

An all-female detective outfit, the "Eyes Enquiry Agency", is formed as a front for the Home Office's new security operation the Covert Activities Thames Section (or "C.A.T.S." for short). Initially led by ex-Oxford Union President Pru Standfast (Rosalyn Landor), she was followed by experienced ex-cop Maggie Forbes (Jill Gascoine) (who later led the section), computer genius Frederica "Fred" Smith (Leslie Ash), and later Tessa Robinson (Tracy-Louise Ward). Their contact with the Ministry was Nigel Beaumont (Don Warrington). The team dealt with a variety of crime from theft to blackmail, to espionage and terrorism.