The residents of Bradfield are devastated when their star midfielder dies, the victim of a bizarre, seemingly motiveless murder.

In a hospital, recovering from injuries, criminal profiler and psychologist Dr. Tony Hill struggles to make sense of the fragments of information he can gather in order to help his ally, Detective Chief Inspector Carol Jordan, bring a killer to justice. Then an explosion rips through a soccer stadium, leaving dozens dead and many more injured, and Jordan finds herself pushed to the margins of the investigation by the intelligence services.

Despite the dark places in their relationship, Tony and Carol remain the best hope for uncovering the truth about an ever-increasing series of unspeakable crimes. Are they terrorist attacks, a personal vendetta . . . or something even more sinister?