26 shots fired, only 25 spent cartridge cases recovered, victims only received 25 bullet entry wounds, 20 bullets recovered from the bodies of the five victims, + one bullet not recovered from the skull of Nicholas Caffell during autopsies performed 7th / 8th August 1985, and a total of five loose bullets recovered from the scene itself, simply adds to the mystery behind these shootings!
There is little doubt in my mind, that the missing 26th Spent bullet case was not found or recovered from the scene in the way the other (?) Spent cartridge cases were accounted for, was because whoever had fired the 26th bullet had fired it from a bolt action type weapon, and for whatever reason best known to themselves, had not felt it necessary to work the bolt of the gun to extract it's corresponding bullet case - in other words, no more bullets were fired by the bolt action rifle, after 'it' had been used to inflict the shot (bullet PV/20) across Sheila's neck in the kitchen...