Daan Viviers, better known as Daan Bobbejee, rescues a stranger fleeing from a gun-waving crowd. After pitting their strength against each other in an arm-wrestling contest that lasts a day and night, Daan and the stranger - Doors Dorrengen - become sworn friends. Daan has also found the partner he has wished for to help him work the diggings inherited from his father. This dismays the scheming diamond smuggler and his accomplices who have their eyes on Daan's diamond-rich claim. Daan and Doors discover the villain's plans to acquire the property, and embark on a cunning and quick counterattack. After some narrow escapes, Daan and Doors get away in the smuggler's car, pursued by the villain himself, airborne and shooting at them from above. The intrepid duo stops on a desolate piece of veld, but it is the the crooks who are in for a nasty surprise.