The brutal murders in "Faceless Killers" expose the dark underbelly of xenophobia lurking beneath the surface of Swedish society. The victims, an elderly couple, are targeted simply because they are perceived as "foreign." This theme is further explored as the investigation unfolds, revealing the deep-seated prejudices and fears that fuel violence and discrimination.

Wallander, a man of strong moral principles, finds himself grappling with the complexities of justice in the face of overwhelming prejudice. He walks a tightrope between his duty to uphold the law and his empathy for marginalized communities targeted by suspicion. This struggle highlights the challenges of maintaining objectivity and fairness when societal biases run deep.

Wallander, a man dedicated to his work, struggles with personal isolation and loneliness. His marriage has crumbled, his relationship with his daughter is strained, and his dedication to his job often comes at the expense of personal connections. This theme of isolation underscores the personal toll that investigating darkness can take on an individual, even as it reveals a larger societal malaise.