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 then had a problem; the method was too efficient as it left Bony (Upfield's 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.