During a live-firing exercise Private Andy Walden a member of the Bedford Light Infantry is killed. Meanwhile Corporal Jo McDonagh is investigating the theft of regimental mascot ""Augustus the 14th. Shorthanded Sergeant Major Burns grudgingly reinstates her back to the rank of Sergeant and a full member of his SIB team. Lance Corporal Stowe, who made the fatal mistake, faces a charge of murder and more worryingly it looks like he was high on LSD at the time.