Detective-Inspector Napoleon Bonaparte–swagman–relaxing in a grove of six cabbage trees, has his noon-day tea break rudely disturbed when Sergeant Errey of the South Australian Police Department is killed by a bomb from a silver-gray monoplane which totally destroys the car in which he is riding. Bony rescues a leather attache case from near the burning vehicle and encounters Writjitandil, Chief of the Wantella Nation. This is a tremendously exciting bush adventure with kidnapping, torture and snakebite (not the least agonizing description being the treatment of the snakebite). Bony solves the mystery in his usual great manner.