It was a case that shocked the United Kingdom and the wider world. Lucy Letby, a young nurse, was found guilty of murdering premature babies. She was a serial killer whose target was not just the youngest, most vulnerable human beings alive, but also those entrusted to her care. But, is everything as clear as it seems? Host Amanda Knox asks if this case is really as open and shut as the world believes or if – in fact – there is reasonable doubt.