The Heelers are settling down into their new way of life with Sergeant Tess Gallagher in charge. Accepting the new system is not so easy. Tess has brought with her the new style of policing , and this doesn't sit comfortably with the old fashioned country way of doing things. A suspected greyhound ring-in puts pressure on the new and old ways. No one will cooperate with Ben and Jo in their investigation except for the track steward, who is, perhaps a little too keen to be of assistance. Tess, too, seems uncooperative at first. To her mind Ben and Jo are barking up the wrong tree. Is policing only about catching the crim and finding the evidence, or is there a place for compassion and discretion? As the bid to solve the case becomes a race against the clock, Ben and Jo, as well as Tess, learn that nothing is ever black and white.