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In a beautiful family home in Glasgow's West End, a mother and her young son are found brutally murdered. DI Costello knows exactly who did it: George Haggerty, husband and father. Problem is, he was caught speeding on the A9 at the time of the murders. Costello can't let it go, and launches her own investigation. DCI Colin Anderson has no time to brood on his partner of twenty years going rogue. His own cases are piling up. But Costello has completely disappeared while pursuing a man she believes is a ruthless killer.