In the eyes of the law, former neonatal nurse Lucy Letby is one of Britain's worst ever serial killers, found guilty of the murder of seven babies and the attempted murder of many others. This documentary explores new questions that have emerged about the case, as well as meeting experts who hope to have it officially reviewed
| Actor | Role |
|---|---|
 Lucy BriersSelf - Narrator (voice) | Self - Narrator (voice) |
| LLucy LetbySelf (archive footage) | Self (archive footage) |
| PProfessor David LivermoreSelf | Self |
| DDr Faye SkeltonSelf | Self |
| DDr Svilena DimitrovaSelf | Self |
 Phil HammondSelf | Self |
| AAlan Wayne JonesSelf | Self |
| DDr Waney SquierSelf | Self |