Despite being known for his explosive temper, Luther also understands the importance of being kind to people. At the beginning of the movie, he approaches Corinne Aldrich, the mother of the serial killer's latest kidnapping victim, and tries to make her feel better by promising he will find her son. Sadly, Luther doesn't anticipate being arrested for his past misbehaviors while working for the police. As a result, the kidnapping remains unsolved, and Corinne has to discover the passing of his son in a particularly gruesome way. This leads her to resent Luther and go as far as visiting him in prison to call him a liar for breaking his promise.
Luther will have another chance at gaining Corinne's trust, though. After he escapes prison and misses a chance to capture the serial killer, he comes up with the theory. Given the murderer's fascination with witnessing the suffering the families of the victims go through, Luther concludes that he might have befriended some of them. He shares this idea with Corinne, who confirms she met a man named Tommy in a support group, who expressed sympathy for her loss and drove her to prison to confront Luther.
After the horrifying realization that the serial killer enjoys watching her suffer in her everyday life, she is devastated but also convinced that she wants to help Luther catch the man.
