Tommy Bell's safe outback holiday on a farm with Martin and Combo is turned upside down when Martin finds a pair of magic old bushranger's boots. This time, when Tommy's cabbage-tree hat sends him back to the past, his friend Martin is right there beside him. The boys join their new friend, Harry, and his gang on a long cattle-droving expedition across Outback Australia. For once it seems as if a journey to the past might be pure, fun adventure, without any risk of running into bushrangers. But why did Harry lie about his past? And who are the 'thievin'' McKenzies? It looks like Tommy and Martin's 'Outback Adventure' might be more dangerous than they expected...