A story about Jim Craig and 18 year old who has recently lost his father in trying to capture 'the colt from Old Regret' has to win the respect from the men of the high country to run his fathers farm located near Mt. Kosciusko. After his father's death he is forced to work on the low lands for Harrison whose brother is good friends of Jims. While working on the farm Jim falls in love with Harrison's daughter Jessica. After Harrisons's prize colt has disappeared a roundup of the brumbies in the highlands is going to be conducted with Clancy of the Overflow in the lead.