Anna Cottrell's documentary looks at three high profile sports officiators and what makes them tick. Billy Bowden, the showman of international cricket, took up umpiring when arthritis prevented him from playing. Southlander Paddy O'Brien left police to become one of the world's top rugby referees. Pin-up Steve Walsh began refereeing when a neck injury curtailed contact sports. The Whistle Blowers explores the qualities that made them successful sports policemen. After a public battle with alcoholism, Walsh returned to refereeing at the top level in Australia.