Baby J, a premature baby girl, is the focus of this episode. Born 8 weeks early and recovering well, her parents were preparing to take her home. However, during a night shift, Lucy Letby allegedly smothered Baby J, causing her to suffer a seizure. The episode covers the events of that night, including Baby J's low oxygen levels and smothering allegations. It also discusses a distressing phone call informing the parents that their daughter has collapsed, as well as an incident at the hospital involving Baby J and criticism of Dr Evans.