Becoming Ian Brady S01E03 - Comeuppance

After killing four children, Ian Brady's ego builds and he looks to expand his cult. Brady and Hindley lure a 17 year old lad back to their home where Brady sets about killing him. Their ‘new recruit', David Smith is also lured to the house to help clean up the aftermath of the violent murder but instead of joining the clan, he calls the police and tells them about what he's just witnessed.