In the summer of 1971 two young boys stumble across the mutilated bodies of a young mother and a Catholic priest. When crucial evidence they provide is ignored by police, the wrong man is convicted. As he languishes in prison, a series of similar macabre double-killings takes place in the years that follow.

When one of the boys reaches adulthood, he realises that he can identify the true perpetrator. He also meets and falls in love with the daughter of the wrongly convicted prisoner, but they now become the new targets of the true killer and his accomplice.

Flashover is the story of psychopathic and misogynistic serial murder, miscarriage of justice, political ambition, and the redeeming power of love. Against a background of religious uncertainty and political change, we follow the story of two young people whose lives have been turned upside down by murder, and their pursuit of justice. At the same time, we are introduced to the killers, who are driven by a desire for political advancement, and the pathological need to inflict sadistic suffering on others.