Helsingborg police must solve the unsolveable. A wave of apparently random homicides is sweeping through their idyllic seaside town. The murders have no pattern, no order, no reason. The perpetrator is immune to psychological profiling; forensically untraceable; utterly invulnerable to modern police techniques.

The body count is growing. But lead investigator Fabian Risk is distracted by his mission to expose a corrupt colleague, and his boss Astrid is spiralling back into addiction ...