When the dastardly organisation STENCH steals a top secret chemical formula, it's clear the British secret service must do something - and quick. Unfortunately, their sole available resource is Agent Desmond Simpkins and his bumbling trainees Crump, Bind and Honeybutt. Nevertheless, the country's finest are soon in hot pursuit of the terrorists, on a trail that will take them as far afield as Austria and Algeria. The only thing that stands between them and success is their incompetence. Gerald Thomas's spy spoof, the last Carry On to be shot in black and white, also stars Jim Dale and Eric Barker.