 On the stud farm of Kangarooie, squatter's daughter Bobbie wants her weak brother Richard to come home for her birthday, but her prefers the charms of the city, in particular the high society adventuress, Mrs Fane.Tubby Dennis O'Hara, who is in love with Bobbie, persuades Richard to come home and he brings Mrs Fane with him.O'Hara gives Bobbie his horse, Alert, as a present.