Lucy Letby was found guilty of unimaginable crimes – murdering seven babies and attempting to murder seven more. But her conviction has become one of the most divisive in British history. A panel of international experts says there’s no evidence any crimes were committed, while the police push for more charges against Letby and a public inquiry takes her guilt as a matter of fact. Both sides depend on complex medical evidence to explain how the babies died. Reporter Judith Moritz investigates the evidence and finds flaws in the theories presented by both prosecution and defence experts.