Upfield had already written three novels, but was working as a fence boundary rider on the rabbit-proof fence in Western Australia. He had decided to write another
detective novel, but with a plot difference; there being no body for the detective to find. Unfortunately, he could not think of a way to dispose of a body. He mentioned this difficulty to a colleague, George Ritchie. Ritchie devised a disposal method: burn the victim's body along with that of a large animal, sift any metal fragments out of the ashes, dissolve them in acid, pound any remaining bone fragments into dust, then discard the remains into the wind. But Upfield had a problem, as he believed the method was too efficient and would leave his character
Bony (a fictional detective) with no way to detect or prove the murder. Upfield challenged Ritchie to find a flaw in the method and offered him £1 if he could. Ritchie, however, was unable to do so. The plot of the novel hinged on this point. One day Ritchie met Rowles, whom Upfield also knew. Ritchie mentioned the problem to him. All of Upfield's friends and colleagues were soon aware of Upfield's difficulties with his plot. On 5 October 1929, Upfield, Ritchie, Rowles, the son of an inspector of the fence, and a north boundary rider for the fence, were all present at the Camel Station homestead when the murder method for Upfield's book was again discussed. Upfield said that Rowles knew of the murder method before this date, but the meeting and discussion were later used as evidence in court to prove that Rowles was aware of the method. ==Ryan, Lloyd, and Carron disappear==