"Julie Ridgehaven, who has been attending school in California, is called back to her home in Sydney, Australia, because her fiancé Ron McLaren is lost in the bush. Julie's friend Betz Condon accompanies her, and the girls go with members of the Ridgehaven family on an expedition to search for Ron. Also in the party are Aunt Isabelle, who has been very ill; and Wally Ridgehaven, who becomes increasingly interested in Betz Condon. The women take over the housekeeping duties at the station, and the men set out in search of Ron. Julie is concerned over the strange actions of Ron's kelpie, and she feels that the dog knows something about Ron's strange disappearance.