Detective Gary Hyde is on his way to his son's tenth birthday party when he and his best friend and fellow detective, Nick Petrides are called to a homicide. It's routine until the murder victim's van explodes, killing Nick instantly. Gary breaks the news to Nick's pregnant widow, Angela, and vows to find whoever is responsible. Gary draws strength from his wife, Sonya and soccer-mad son, Oscar - a leukaemia survivor. Together with his new partner Claire McKenzie, Australian Federal Police boss Jackie Walters and Australian Security Intelligence Organisation chiefs, Gary uncovers a criminal underbelly of murder and fraud as he is thrust into the secretive world of homeland security. In a world where crime has no borders and everyone has something to hide, Gary's wife and young children find themselves in the firing line.