Based on Arthur Upfield's character Bony but not on a specific novel, the narrative concerns a light aircraft that disappears after a forced landing on an emergency airstrip in the bush. Concerns are heightened because the plane was carrying a payroll. While investigating the plane's disappearance, Inspector Bonaparte and Constable Alice McGorr are drawn to a nearby convent. Realising that this 'silent order' (where the nuns are not permitted to speak) may hold the key to the case, McGorr enters the convent undercover. Meanwhile, Boney searches the bush for two kangaroo shooters who prefer human game.