The Investigation of Lucy Letby is a feature-length documentary offering the most comprehensive examination yet of one of Britain's most notorious criminal cases. The film features exclusive testimony from the British police who led the investigation, alongside never-before-seen footage of Letby during her arrests and police questioning. Featuring interviews with leading experts and lawyers representing different perspectives, the documentary also includes a powerful AI-anonymised interview with the mother of one of the victims, who speaks publicly about her experience and involvement in the trial for the first time. Bringing together exclusive access, compelling testimony and previously unseen material, The Investigation of Lucy Letby is the definitive documentary on a case that continues to captivate and divide public opinion.