In the concrete sprawl of South London, Axel Prefect's ambition for a dazzling start to his job at the National Crime Agency clashes with the reality of skeptical colleagues and tedious bureaucracy. Haunted by the chilling 'Keepsake Killer' case, Axel strives to prove his worth under the scrutiny of Raymond Inge, while also managing his complex relationship with Evie. Their reunion is tense, charged with unresolved truths and professional rivalry; neither of them wants to over-complicate their already challenging lives. As Axel delves deeper into crime analysis, shadows begin to gather around him and he discovers the job is more intricate than he anticipated. Catching killers may be just the beginning of his story.